The HCF and LCM of two numbers are 13 and 1989 respectively. If one of the numbers is 117, then the other number is
222
221
223
225
The sum of two natural numbers is 8. Determine the numbers if the sum of their reciprocals is ?
1,7
4,4
2,6
5,3
A rectangle is divided horizontally into two equal parts. The upper part is further divided into three equal parts and the lower part is divided into four equal parts. Which fraction of the original rectangle is the shaded part?
The factorisation of 25-p2-q2-2pq is
(5+p+q)(5-p-q)
(5+p-q)(5-p+q)
(5+p-q)(5-p-q)
(5+p+q)(5-p+q)
If a, b and c are three natural numbers in ascending order, then
c2 - a2 = b2
c2 - a2 < b2
c2 + b2 = a2
c2 - a2 > b