Let x,y,z be different integers less tha...

Let x,y,z be different integers less than or equal to 14. The arithmetic mean of x and y is 10 and the geometric mean of x and z is 2 `sqrt(21)` then harmonic mean of y and z is equal to

A

A) `(672)/(37)`

B

B) `(312)/(25)`

C

C) `(336)/(37)`

D

D) `(624)/(25)`

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