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0 votes
12.4k views
in Permutations and combinations by (52.7k points)

The number of ways in which 420 can be resolved into three positive factors other than unity and having LCM 420 is

(A)  6

(B)  12 

(C)  18 

(D)  None of these

1 Answer

+1 vote
by (46.6k points)
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Best answer

Correct option (A) 6

420 = 3 x 4 x 5 x 7

⇒  Number of ways = 4C2 = 6

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