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4 The number of number-pairs lying between 40 and 100 which has 15 as their HCF is?
A. 3
B. 4
C. 5
D. 6
See Answer & Explanation Lets Discuss
Correct answer is : B
Explanation

The first number divisible by 15 after 40 is 45.

So, the pairs divisible by 15  are:

45,60

45,75

45,90 (HCF is 30)

then

60, 75

60,90(HCF is 30)

75,90 

Hence the remaining pairs with HCF 15 are: 

45,60

45,75

60,75

75,90

 

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