Problems on H.C.F and L.C.M
A rectangular courtyard 3.78 meters long 5.25 meters wide is to be paved exactly with square tiles, all of the same size. what is the largest size of the tile which could be used for the purpose?

42 cms
14 cms
21 cms
None of these

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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:

4
2
3
1

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