Question

If the coefficients of second, third and fourth terms in the
expansion of (1 + x)²ⁿ are in A.P., then
(a) 2 n² + 9 n + 7 = 0 (b) 2n² - 9 n + 7 = 0
(c) 2 n² - 9 n - 7 = 0 (d) none of these

Answer 1

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