question_answer

Suppose a, x, y, z and b are in A.P. when x + y + z = 15, and \[a,\alpha ,\beta ,\gamma ,b\] are in H.P. when \[\frac{1}{\alpha }+\frac{1}{\beta }+\frac{1}{\gamma }=\frac{5}{3}\]. Find a if a > o.

Answer:

9