The arithmetic mean and harmonic mean of two numbers is x and y respectively, then the geometric mean of the two numbers is
A.M∗H.M=G.M2
If the geometric mean and arithmetic mean of two numbers is 2 and 4 respectively. Then the harmonic mean of the two numbers is
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 the harmonic mean of two numbers is 10 and 6.4. Then their geometric mean is___