The smallest 5 digit number that can be formed by the digits 4, 9, 8, 1 and 7 (Assuming no repetition of digits) is ____.

14789

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47891

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98741

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78941

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Solution

The correct option is A 14789
To form the smallest number (without repetition of digits) from the given digits, write the digits in ascending order.

Here 1 < 4 < 7 < 8 < 9

Therefore, the smallest 5 digit number that can be formed by the digits 4, 9, 8, 1 and 7 is 14789.

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How many 3-digit numbers can be formed from the digits 5, 6, 7, 8 and 9 assuming that

(i) Repetition of the digits is allowed?

(ii) Repetition of the digits is not allowed?

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