Numbers & Algebra

1:

What is the harmonic mean of two numbers whose geometric mean and arithmetic mean is 8 and 5 respectively?

A.

12.8

B.

12

C.

13.5

D.

14.6

 

Answer : A

Explanation :

(GM)2= HM x AM
HM = (8x8)/ 5 = 64/5 = 12.8

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Option: A

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