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Prime Factor Method for H.C.F

H.C.F of 45,3...

Question

H.C.F of 45, 30 & 15 is:

A

45

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B

30

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C

15

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D

1

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Solution

The correct option is C
15

Factors of 45 = 1, 3, 15, 5, 9, 45

Factors of 30 = 1, 2, 3, 5, 6, 10, 15, 30

Factors of 15 = 1, 3, 5, 15

so, highest common factor = 15

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