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Problems on HCF and LCM - General Aptitude

Q1:

The H.C.F. of 9 , 12 , 18 and 21 is:
10 25 35 40

A
3
5

B
252
5

C
3
1400

D
63
700

ANS:C -

3
1400

Required H.C.F. = H.C.F. of 9, 12, 18, 21 = 3
L.C.M. of 10, 25, 35, 40 1400