1
JEE Main 2021 (Online) 27th August Evening Shift
+4
-1
Out of Syllabus
If 0 < x < 1 and $$y = {1 \over 2}{x^2} + {2 \over 3}{x^3} + {3 \over 4}{x^4} + ....$$, then the value of e1 + y at $$x = {1 \over 2}$$ is :
A
$${1 \over 2}{e^2}$$
B
2e
C
$${1 \over 2}\sqrt e$$
D
2e2
2
JEE Main 2021 (Online) 27th August Morning Shift
+4
-1
Out of Syllabus
If 0 < x < 1, then $${3 \over 2}{x^2} + {5 \over 3}{x^3} + {7 \over 4}{x^4} + .....$$, is equal to :
A
$$x\left( {{{1 + x} \over {1 - x}}} \right) + {\log _e}(1 - x)$$
B
$$x\left( {{{1 - x} \over {1 + x}}} \right) + {\log _e}(1 - x)$$
C
$${{1 - x} \over {1 + x}} + {\log _e}(1 - x)$$
D
$${{1 + x} \over {1 - x}} + {\log _e}(1 - x)$$
3
JEE Main 2021 (Online) 27th August Morning Shift
+4
-1
Out of Syllabus
If for x, y $$\in$$ R, x > 0, y = log10x + log10x1/3 + log10x1/9 + ...... upto $$\infty$$ terms

and $${{2 + 4 + 6 + .... + 2y} \over {3 + 6 + 9 + ..... + 3y}} = {4 \over {{{\log }_{10}}x}}$$, then the ordered pair (x, y) is equal to :
A
(106, 6)
B
(104, 6)
C
(102, 3)
D
(106, 9)
4
JEE Main 2021 (Online) 26th August Morning Shift
+4
-1
Out of Syllabus
The sum of the series

$${1 \over {x + 1}} + {2 \over {{x^2} + 1}} + {{{2^2}} \over {{x^4} + 1}} + ...... + {{{2^{100}}} \over {{x^{{2^{100}}}} + 1}}$$ when x = 2 is :
A
$$1 + {{{2^{101}}} \over {{4^{101}} - 1}}$$
B
$$1 + {{{2^{100}}} \over {{4^{101}} - 1}}$$
C
$$1 - {{{2^{100}}} \over {{4^{100}} - 1}}$$
D
$$1 - {{{2^{101}}} \over {{2^{400}} - 1}}$$
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