Question

If am and gm of 2 numbers is 10 and 8 respectively find hm

Answer 1

look hm =
$\frac{2ab}{a + b}$
gm=8
so ab=64
am=10
so a+b=20
hence hm=6.4

Answer 2

( G. M) ² = A. M * H. M

A. M = 10
G. M = 8

8² = 10 * H. M

64/10 = H. M

6.4 = H. M.


Therefore, Harmonic mean = 6.4