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For non-negative integers s and r, let$$\left( {\matrix{ s \cr r \cr } } \right) = \left\{ {\matrix{ {{{s... JEE Advanced 2020 Paper 2 Offline ## Numerical More Let$$X = {({}^{10}{C_1})^2} + 2{({}^{10}{C_2})^2} + 3{({}^{10}{C_3})^2} + ... + 10{({}^{10}{C_{10}})^2}$$, where$${}^{...
JEE Advanced 2018 Paper 2 Offline
Let $$m$$ be the smallest positive integer such that the coefficient of $${x^2}$$ in the expansion of $${\left( {1 + x} ... JEE Advanced 2016 Paper 1 Offline The coefficient of three consecutive terms of$${\left( {1 + x} \right)^{n + 5}}$$are in the ratio$$5:10:14.$$Then ... JEE Advanced 2013 Paper 1 Offline ## MCQ (Single Correct Answer) More Coefficient of$${x^{11}}$$in the expansion of$${\left( {1 + {x^2}} \right)^4}{\left( {1 + {x^3}} \right)^7}{\left( {1...
JEE Advanced 2014 Paper 2 Offline
For $$r = 0,\,1,....,$$ let $${A_r},\,{B_r}$$ and $${C_r}$$ denote, respectively, the coefficient of $${X^r}$$ in the e...
IIT-JEE 2010 Paper 2 Offline
The value of $$\left( {\matrix{ {30} \cr 0 \cr } } \right)\left( {\matrix{ {30} \cr {10} \cr } ... IIT-JEE 2005 Screening If$${}^{n - 1}{C_r} = \left( {{k^2} - 3} \right)\,{}^n{C_{r + 1,}}$$then$$k \in $$IIT-JEE 2004 Screening Coefficient of$${t^{24}}$$in$${\left( {1 + {t^2}} \right)^{12}}\left( {1 + {t^{12}}} \right)\left( {1 + {t^{24}}} \ri...
IIT-JEE 2003 Screening
The sum $$\sum\limits_{i = 0}^m {\left( {\matrix{ {10} \cr i \cr } } \right)\left( {\matrix{ {20} \cr ... IIT-JEE 2002 Screening In the binomial expansion of$${\left( {a - b} \right)^n},\,n \ge 5,$$the sum of the$${5^{th}}$$and$${6^{th}}$$term... IIT-JEE 2001 Screening For$$2 \le r \le n,\,\,\,\,\left( {\matrix{ n \cr r \cr } } \right) + 2\left( {\matrix{ n \cr {r - ...
IIT-JEE 2000 Screening
If in the expansion of $${\left( {1 + x} \right)^m}{\left( {1 - x} \right)^n},$$ the coefficients of $$x$$ and $${x^2}$$...
IIT-JEE 1999
If $${a_n} = \sum\limits_{r = 0}^n {{1 \over {{}^n{C_r}}},\,\,\,then\,\,\,\sum\limits_{r = 0}^n {{r \over {{}^n{C_r}}}} ... IIT-JEE 1998 The expansion$${\left( {x + {{\left( {{x^3} - 1} \right)}^{{1 \over 2}}}} \right)^5} + {\left( {x - {{\left( {{x^3} - 1...
IIT-JEE 1992
If $${C_r}$$ stands for $${}^n{C_r},$$ then the sum of the series $${{2\left( {{n \over 2}} \right){\mkern 1mu} !{\mke... IIT-JEE 1986 The coefficient of$${x^4}$$in$${\left( {{x \over 2} - {3 \over {{x^2}}}} \right)^{10}}$$is IIT-JEE 1983 Given positive integers$$r &gt; 1,\,n &gt; 2$$and that the coefficient of$$\left( {3r} \right)$$th and$$\left( {r + ...
IIT-JEE 1983

## Subjective

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Prove that $${2^k}\left( {\matrix{ n \cr 0 \cr } } \right)\left( {\matrix{ n \cr k \cr } } \rig... IIT-JEE 2003 Use mathematical induction to show that$${\left( {25} \right)^{n + 1}} - 24n + 5735$$is divisible by$${\left( {24} \...
IIT-JEE 2002
A coin probability $$p$$ of showing head when tossed. It is tossed $$n$$ times. Let $${p_n}$$ denote the probability tha...
IIT-JEE 2000
Let $$a,\,b,\,c$$ be possitive real numbers such that $${b^2} - 4ac &gt; 0$$ and let $${\alpha _1} = c.$$ Prove by induc...
IIT-JEE 2000
For every possitive integer $$n$$, prove that $$\sqrt {\left( {4n + 1} \right)} &lt; \sqrt n + \sqrt {n + 1} &lt; \s... IIT-JEE 2000 For any positive integer$$m$$,$$n$$(with$$n \ge m$$), let$$\left( {\matrix{ n \cr m \cr } } \right) = {...
IIT-JEE 2000
Let $$n$$ be any positive integer. Prove that $$\sum\limits_{k = 0}^m {{{\left( {\matrix{ {2n - k} \cr k \cr ... IIT-JEE 1999 Let$$p$$be a prime and$$m$$a positive integer. By mathematical induction on$$m$$, or otherwise, prove that whenever... IIT-JEE 1998 Let$$0 &lt; {A_i} &lt; n$$for$$i = 1,\,2....,\,n.$$Use mathematical induction to prove that$$$\sin {A_1} + \sin {A... IIT-JEE 1997 Using mathematical induction prove that for every integer $$n \ge 1,\,\,\left( {{3^{2n}} - 1} \right)$$ is divisible by ... IIT-JEE 1996 Let $$n$$ be a positive integer and $${\left( {1 + x + {x^2}} \right)^n} = {a_0} + {a_1}x + ............ + {a_{2n}}{x^{2... IIT-JEE 1994 If$$x$$is not an integral multiple of$$2\pi $$use mathematical induction to prove that :$$$\cos x + \cos 2x + .......
IIT-JEE 1994
Prove that $$\sum\limits_{r = 1}^k {{{\left( { - 3} \right)}^{r - 1}}\,\,{}^{3n}{C_{2r - 1}} = 0,}$$ where $$k = \left(... IIT-JEE 1993 Using mathematical induction, prove that$${\tan ^{ - 1}}\left( {1/3} \right) + {\tan ^{ - 1}}\left( {1/7} \right) + .....
IIT-JEE 1993
Let $$p \ge 3$$ be an integer and $$\alpha$$, $$\beta$$ be the roots of $${x^2} - \left( {p + 1} \right)x + 1 = 0$$ us...
IIT-JEE 1992
If $$\sum\limits_{r = 0}^{2n} {{a_r}{{\left( {x - 2} \right)}^r}\,\, = \sum\limits_{r = 0}^{2n} {{b_r}{{\left( {x - 3} \... IIT-JEE 1992 Using induction or otherwise, prove that for any non-negative integers$$m$$,$$n$$,$$r$$and$$k$$,$$\sum\limits_{m ...
IIT-JEE 1991
Prove that $${{{n^7}} \over 7} + {{{n^5}} \over 5} + {{2{n^3}} \over 3} - {n \over {105}}$$ is an integer for every posi...
IIT-JEE 1990
Prove that $${C_0} - {2^2}{C_1} + {3^2}{C_2}\,\, - \,..... + {\left( { - 1} \right)^n}{\left( {n + 1} \right)^2}{C_n} ... IIT-JEE 1989 Using mathematical induction, prove that$${}^m{C_0}{}^n{C_k} + {}^m{C_1}{}^n{C_{k - 1}}\,\,\, + .....{}^m{C_k}{}^n{C_0}...
IIT-JEE 1989
Let $$R$$ $$= {\left( {5\sqrt 5 + 11} \right)^{2n + 1}}$$ and $$f = R - \left[ R \right],$$ where [ ] denotes the grea...
IIT-JEE 1988
Prove by mathematical induction that $$- 5 - {{\left( {2n} \right)!} \over {{2^{2n}}{{\left( {n!} \right)}^2}}} \le {1 ... IIT-JEE 1987 Use method of mathematical induction$${2.7^n} + {3.5^n} - 5$$is divisible by$$24$$for all$$n &gt; 0$$IIT-JEE 1985 Given$${s_n} = 1 + q + {q^2} + ...... + {q^2};{S_n} = 1 + {{q + 1} \over 2} + {\left( {{{q + 1} \over 2}} \right)...
IIT-JEE 1984
If $$p$$ be a natural number then prove that $${p^{n + 1}} + {\left( {p + 1} \right)^{2n - 1}}$$ is divisible by $${p^2}... IIT-JEE 1984 Use mathematical Induction to prove : If$$n$$is any odd positive integer, then$$n\left( {{n^2} - 1} \right)$$is divi... IIT-JEE 1983 If$${\left( {1 + x} \right)^n} = {C_0} + {C_1}x + {C_2}{x^2} + ..... + {C_n}{x^n}$$then show that the sum of the produ... IIT-JEE 1983 Prove that$${7^{2n}} + \left( {{2^{3n - 3}}} \right)\left( {3n - 1} \right)$$is divisible by 25 for any natural number... IIT-JEE 1982 Given that$${C_1} + 2{C_2}x + 3{C_3}{x^2} + ......... + 2n{C_{2n}}{x^{2n - 1}} = 2n{\left( {1 + x} \right)^{2n - 1}}$$... IIT-JEE 1979 ## Fill in the Blanks More The sum of the rational terms in the expansion of$${\left( {\sqrt 2 + {3^{1/5}}} \right)^{10}}$$is ............... IIT-JEE 1997 Let$$n$$be positive integer. If the coefficients of 2nd, 3rd, and 4th terms in the expansion of$${\left( {1 + x} \rig...
IIT-JEE 1994
If $${\left( {1 + ax} \right)^n} = 1 + 8x + 24{x^2} + .....$$ then $$a=..........$$ and $$n =............$$
IIT-JEE 1983
The sum of the coefficients of the plynomial $${\left( {1 + x - 3{x^2}} \right)^{2163}}$$ is ...............
IIT-JEE 1982
The larger of $${99^{50}} + {100^{50}}$$ and $${101^{50}}$$ is ..............
IIT-JEE 1982

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