Q39. How many numbers between 1000 and 10,000 contain only the digits 1, 3, 5, and 7?

(a) 16

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(b) 24

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(d) None of the above

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Solution

The correct option is B
(b) 24

Whatever way you arrange 1, 3, 5, and 7, the result would be between 1,000 and 10,000 Hence 4! numbers would be having only the digits 1, 3, 5, and 7.

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How many numbers are there between 100 and 1000 which exactly have one of their digits as 7?

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