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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(x) =f (-1) and a, b and c are in A.P then f(a) f(b) and f(c ) are in

A

A.P.

B

G.P.

C

H.P.

D

Arithmetic geometric progression

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The correct Answer is:
A
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