The LCM and HCF of 45, 75 and 30 will be _ and _ respectively.

1, 15

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450, 30

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75, 30

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450, 15

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Solution

The correct option is D 450, 15
We will find HCF and LCM using prime factorisation method,
Prime factorisation:
45 = 3 x 3 x 5
75 = 3 x 5 x 5
30 = 2 x 3 x 5
HCF = 3x5 = 15
LCM = 3x3x5x5x2= 450

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