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Question

The number of numbers less than or equal to 666 which are the products of exactly 4 distinct positive prime numbers is:

A
4
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B
8
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C
7
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D
can't be determined
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Solution

The correct option is C 7
666=2×32×37
Now, following are the cases possible for different integer values of a, b, c, d:
1. 2a×3b×5c×7d2. 2a×3b×5c×11d3. 2a×3b×5c×13d4. 2a×3b×5c×17d5. 2a×3b×5c×19d6. 2a×3b×7c×11d7. 2a×3b×7c×13d

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