Which of the following numbers has the highest number of unique prime factors?
A
12
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B
30
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C
9
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D
121
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Solution
The correct option is B 30 Prime factorising the given numbers is: 12=2×2×3 30=2×3×5 9=3×3 121=11×11 ∴ 30 has the highest number of unique prime factors which are 2, 3 and 5.