JEE Main 2022 (Online) 25th June Evening Shift | Sequences and Series Question 48 | Mathematics

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JEE Main 2022 (Online) 25th June Evening Shift

MCQ (Single Correct Answer)

-1

The sum 1 + 2 . 3 + 3 . 3² + ......... + 10 . 3⁹ is equal to :

$${{2\,.\,{3^{12}} + 10} \over 4}$$

$${{19\,.\,{3^{10}} + 1} \over 4}$$

$$5\,.\,{3^{10}} - 2$$

$${{9\,.\,{3^{10}} + 1} \over 2}$$

JEE Main 2022 (Online) 25th June Evening Shift

MCQ (Single Correct Answer)

-1

If $${b_n} = \int_0^{{\pi \over 2}} {{{{{\cos }^2}nx} \over {\sin x}}dx,\,n \in N} $$, then

$${b_3} - {b_2},\,{b_4} - {b_3},\,{b_5} - {b_4}$$ are in A.P. with common difference $$-$$2

$${1 \over {{b_3} - {b_2}}},{1 \over {{b_4} - {b_3}}},{1 \over {{b_5} - {b_4}}}$$ are in an A.P. with common difference 2

$${b_3} - {b_2},\,{b_4} - {b_3},\,{b_5} - {b_4}$$ are in a G.P.

$${1 \over {{b_3} - {b_2}}},{1 \over {{b_4} - {b_3}}},{1 \over {{b_5} - {b_4}}}$$ are in an A.P. with common difference $$-$$2

JEE Main 2022 (Online) 24th June Evening Shift

MCQ (Single Correct Answer)

-1

Let x, y > 0. If x³y² = 2¹⁵, then the least value of 3x + 2y is

JEE Main 2022 (Online) 24th June Morning Shift

MCQ (Single Correct Answer)

-1

If $$\{ {a_i}\} _{i = 1}^n$$, where n is an even integer, is an arithmetic progression with common difference 1, and $$\sum\limits_{i = 1}^n {{a_i} = 192} ,\,\sum\limits_{i = 1}^{n/2} {{a_{2i}} = 120} $$, then n is equal to :

104

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