Let fx) be a polynomial function of seco...

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

A

G.P

B

H.P

C

A.G.P

D

A.P

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The correct Answer is:

D

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