17. If the coefficients of 2nd, 3rd and 4th terms in the expansion of ` (1+x)^(2n)` are in A.P.. Show that `2n^2-9n+7=0`

17. If the coefficients of 2nd, 3rd and 4th terms in the expansion of ` (1+x)^(2n)` are in A.P.. Show that `2n^2-9n+7=0`
A. `2n^(2) + 9n+7 = 0`
B. `2n^(2) - 9n + 7 = 0`
C. `2n^(2) - 9n - 7 = 0`
D. none of these

17. If the coefficients of 2nd, 3rd and 4th terms in the expansion of ` (1+x)^(2n)` are in A.P.. Show that `2n^2-9n+7=0`

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