The number of ordered pairs

a,b ε N. The number of ordered pairs (a,b), a<b such that 1/a + 1/b = 1/2013 is

(a) 11 (b) 13 (c) 17 (d) 21

2 Answers

2305
Shaswata Roy ·

(b)13

1057
Ketan Chandak ·

rearrange the expression and write it as
(a-2013)(b-2013)=20132
now it's quite simple after that..

Your Answer

Close [X]