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What is the smallest number that can be formed by the digits 4, 7, 1, and 9 such that the digits are not repeated?

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1479

1497

1974

1749

answer is B.

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Detailed Solution

The given digits are 4, 7, 1, and 9.

Now to obtain the smallest number, we need to arrange digits in increasing order.

Therefore, 1 < 4 < 7 < 9.

So, the smallest number that can be formed by the digits 4, 7, 1, and 9 such that the digits are not repeated, will have 1 in the thousands place, 4 in the hundreds place, 7 in the tens place, and 9 in the one's place.

Hence, the smallest number is 1479.

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