Q143
The number of pairs of positive integers whose sum is 99 and HCF is 9 is = ?
A.
5
AnswerB.
2
C.
3
D.
4
Answer: Option A
Solution
Answer: Option A
Solution:
According to question,HCF = 9
⇒ Then the two number will be 9a, 9b
⇒ 9a + 9b = 99
⇒ a + b = 11
⇒ Pairs of positive integer (1, 10) (2, 9) (3, 8) (4, 7) (5, 6) = 5