1.

The HCF and the LCM of 12, 21, 15 respectively are(a) 3, 140 (b) 12, 420 (c) 3, 420 (d) 420, 3

Answer»

The correct option is (c) 3, 420

12 = 2 × 2 × 3 

21 = 3 × 7 

15 = 5 × 3 

HCF = 3 

L.C.M = 2 × 2 × 3 × 5 × 7 = 420



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