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Question

Find the H.C.F of 90 and 162.

A
9
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B
18
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C
27
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D
3
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Solution

The correct option is B 18

Using prime factorisation method:

290345315551

90=2×3×3×5

216238132739331

162=2×3×3×3×3

90=2×5×3×3
162=2×3×3×3×3

The HCF is 2×3×3=18


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