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if H. M and G. M of two numbers are 147 and 21 respectively then find their arithmetic mean

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For two numbers $a$ and $b$

$H.M = \frac{2ab}{a+b}$

$G.M = \sqrt{ab}$

$A.M = \frac{a+b}{2}$

$A.M * H.M = G.M^2$

$A.M = \frac{G.M^2}{H.M} = \frac{21^2}{147} = 3$
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