Question

31. The coefficient of x^n in the expansion of
2 + x + x^2/(1 – 3x + 6x^2 - 10x^3 + ...∞)
(a) (n + 1)^2 (-1)^n
(b) (-1)^n[n^2 + 2n + 3]
(e) (-1)^n (n + 1)^2 + (-1)^n
(d) (-1)^n{n + n + 2]
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Answer 1

Answer:

This answer is the B is the answer