1.

If sum of two numbers is 1215 and their HCF is 81, then the possible number of pairs of such numbers are (a) 2(b) 3(c) 4(d) 5

Answer»

Correct answer is: (c) 4

Since HCF = 81, two numbers can be taken as 81x and 81y, 

ATQ 81x + 81y = 1215 

Or x + y = 15 

which gives four co prime pairs -

1,14

2,13

4,11

7, 8



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