Question

Which of the following is smallest number having 4' different prime facto
A) 10
B) 66
C) 30
D) 210
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Answer 1

ANSWER:

D) 210

STEP-BY-STEP VERIFICATION :-

$210 \\ = 2 \times 105 \\ = 2 \times 3 \times 35 \\ = 2 \times 3 \times 5 \times 7$

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