If the coeffients of 5th, 6th & 7th terms in expansion of (1+x)n are in AP, then find values of n???

Dear Student

The coefficients of fifth, sixth and seventh terms in the expansion (1 + x)n are respectively.

Given that are in A.P.

[a2a1 = a3a2 ⇒ 2a2 = a3 + a1 where a1, a2 and a3 are the first second and third term of an A.P.]



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