Question

The sum of two natural no is 9 and the sum of their reciprocal is 1/2

Answer 1

a+b=9------(1)

1/a+1/b= 1/2

(b+a)/ab=1/2

ab=2(a+b)= 2(9)=18------(2)

FROM (1) AND (2)

there are only two possiblities i.e a=6,b=3 OR a=3,b=6