Question

the no. of number pairs lying between 40 and 100 with their HCF as 15 is:- a 66,78 b70,82 c94,106 d84,96

Answer 1

Numbers with H.C.F.15 must contain 15 as a factor. Now, multiples of 15 between 40 and 100 are 45, 60, 75 and 90. Number pairs with H.C.F. 15 are (45, 60), (45, 75), (60, 75) and (75, 90).

Answer 2

Answer:

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