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Q.

What is the smallest 4-digit number that can be formed using 8, 5, and 1(any one number can be used twice)?

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a

 158

b

 1058

c

 1158

d

 1518

answer is D.

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Detailed Solution

The given digits are 8, 5, and 1.

To obtain the smallest number, arrange the digits in ascending order, 1 < 5 < 8. 

So, 1 is the smallest number that is used twice and can be placed at the thousand's and hundred's place.

Therefore, the required number is 1158.

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What is the smallest 4-digit number that can be formed using 8, 5, and 1(any one number can be used twice)?