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Let f(x) be a polynomial function of sec...

Let `f(x)` be a polynomial function of second degree. If `f(1) = f(-1)` and `a, b. c` are in A.P., then `f'(a), f'(b),f'(c)` are in

A

G.P.

B

H.P.

C

Arithmetic-Geometric Progression

D

A.P.

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The correct Answer is:
D
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