If the number of terms of the expansion of (1 + x) ^ n is odd and the coefficients of the fifth, sixth and seventh are equal difference, then what is n The title of binomial theorem

If the number of terms of the expansion of (1 + x) ^ n is odd and the coefficients of the fifth, sixth and seventh are equal difference, then what is n The title of binomial theorem

If the expansion of (1 + x) ^ n has an odd number of terms, then n is an even number, the fifth, sixth and seventh terms are C (n, 4) C (n, 5) C (n, 6) are equal difference, then 2 * C (n, 5) = C (n, 4) + C (n, 6) is expanded as 2n (n-1) (n-2) (n-3) (n-4) / 5! = n (n-1) (n-2) (n-3) / 4! + n (n-1) (n-2) (n-3) (n-4) (N-5) / 6! Is reduced to 2 (n-4)