1.

If 21 - x + 21 + x, f(x), 3x + 3-x are A.P.  then minimum value of f(x) is (1) 1(2) 2(3) 3(4) 4

Answer»

Answer is (3) 3

f(x) = ((21 - x + 21 + x + 3x + 3-x)/2)

Using AM ≥ GM

f(x) ≥ 3



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