Q If the coefficient of 2nd , 3rd and 4th terms in the expansion of 1+x2n are in AP - Maths - Binomial Theorem

Question

Q If the coefficient of 2nd , 3rd and 4th terms in the expansion of
1 + x 2 n are in AP then show that 2 n 2 - 9 n   = - 7

Sanjari Kalantri · Accepted Answer

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Q. If the coefficient of 2nd , 3rd and 4th terms in the expansion of 1 + x 2 n are in AP then show that 2 n 2 - 9 n = - 7 .