Problems on H.C.F and L.C.M
Four bells begin to toll together respectively at the intervals of 8, 10, 12 and 16 seconds. After how many seconds will they toll together again?

243 seconds
246 seconds
242 seconds
240 seconds

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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
2
4

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