Coefficient of x 4 in 5 x 2 (1 + x 2) 11 is

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Solution

Q.
$Coefficient of x^{4} in 5 x^{2} {(1 + x^{2})}^{11} is$

1 22

2 33

3 44

4 55

Ans.
(4)

$5 x^{2} (1 + {}^{11}C_{1} x^{2} + \dots)$

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