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Question

If the arithmetic mean of two numbers be A and geometric mean be G, then the numbers will be


A

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B

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C

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D

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Solution

The correct option is C


A.M. = a+b2 = A and G.M. = ab = G

On solving a and b are given by the values

A ±(A+G)(AG).

Trick : Let the numbers be 1, 9. Then A = 5 and G = 3. Now put these values in options.

Here (c) 5±8×2 i.e. 9 and 1


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