If the geometric mean and arithmetic mean of two numbers is 2 and 4 respectively. Then the harmonic mean of the two numbers is
8
16
1
2
The harmonic mean is (G.M.)2(A.M)=1
If the arithmetic mean and harmonic mean of two distinct positive numbers is 16 and 4 respectively, then the geometric mean of the two numbers is
The arithmetic mean and harmonic mean of two numbers is x and y respectively, then the geometric mean of the two numbers is