Problems on H.C.F and L.C.M
The product of two numbers is 2028 and their H.C.F. is 13. The number of such pairs is:

1
3
4
2

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Problems on H.C.F and L.C.M
Find the smallest number which when increased by 5 is divisible by 9, 21, 25 and 30.?

1882
3145
2567
2378

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