There is a unique triplet of positive integers (a, b, c) such that a \leq b \leq c and
\frac{25}{84}=\frac{1}{a}+\frac{1}{a b}+\frac{1}{a b c}.
Determine a+b+c.
There is a unique triplet of positive integers (a, b, c) such that a \leq b \leq c and
Determine a+b+c.