Math, asked by sanjrajan13, 3 months ago

If the coefficient of 7th and 13th term in the
expansion of (1 + x)" are equal, then n=
(1) 10 (2) 15 (3) 18 (4) 20

Answers

Answered by harshilpurohit991

0

Step-by-step explanation:

(x+a)n=xn+C1nxn−1a+...+Crnxn−rar+...anSincethe(r+1)thtermisCrnxn−rar.Hencethecoefficentof7thtermisC6nand13thtermisC12nC6n=C12n⟹n=18

ans is 18

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