Express R As Rational Expression

Given R = (1/a) + (1/b) + (1/c), express R as a rational expression.


Let me see.


LCD on left side is abc.


So, abc ÷ a = bc.

Then, abc ÷ b = ac.

Finally, abc ÷ c = ab


On the right side, I get (bc + ac + ab)/(abc), which is a fraction in terms of a, b, and c.


I say R = (bc + ac + ab)/(abc) is the answer.


You say?