Find the smallest three-digit number using the digits 4, 7, and 9.

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974

497

479

794

answer is C.

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Detailed Solution

Concept: Sort the three numbers in the given order, starting with the smallest digit and working your way up. To produce the smallest three-digit number, put the smallest digit in the hundredth place and the biggest digit in the unit's place.
Using the digits 4, 7, and 9, we must get the shortest three-digit number.
to determine the smallest three-digit number. The specified digits are first arranged in ascending order, or from the smallest number to the highest number.
Then, we put the smallest digit in the hundredth place, the intermediate digit in the tenths place, and the largest digit in the unit's place.
The hundredth place & tenth place places are switched if the digits contain a zero; otherwise, the number would become two digits.
The numerals 4, 7, and 9 are arranged as follows in ascending order: 4, 7, 9.
The hundredth place is now filled with the smallest digit which is 4. Next, since the middle digit is 7, we place it in position ten. Next, as 9 is the largest [6]digit, we put it in the unit's place.
The smallest number made up of the digits 4, 7, and 9 is 479 since there isn't a zero in the number.
Hence, the correct answer is option 3.

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