If sum of two numbers be a and their product be b, then the sum of their reciprocals is :

Answer: Option C

Let the two number are P and Q
P + Q = a
PQ = b
⇒ $$\frac{1}{P}$$ + $$\frac{1}{Q}$$
⇒ $$\frac{Q+P}{PQ}$$
⇒ $$\frac{a}{b}$$