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Find the H.C.F. of the following numbers: 18, 54, 81

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Find the H.C.F. of the following numbers:

18, 54, 81

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Factors of 18 = 2 x 3 x 3 

Factors of 54 = 2 x 3 x 3 x 3 

Factors of 81 = 3 x 3 x 3 x 3

H.C.F. = 3 x 3 = 9

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