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in HCF and LCM by (47.6k points)
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The HCF of this pair of numbers is not 1. 

(A) 13,17 

(B) 29,20 

(C) 40, 20 

(D) 14, 15

1 Answer

+1 vote
by (46.9k points)
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Best answer

(C) 40, 20 

40 = 2 x 2 x 2 x 5 

20 = 2 x 2 x 5 

∴ HCF of 40 and 20 = 2 x 5 = 10

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