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If  x% of four-digit numbers have a repeated digit of 3, then what is x ? Express your answer as a decimal to the nearest tenth.

 Nov 15, 2020
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There are: 9,999 - 1,000 + 1 =9,000 four-digit numbers between 1,000 and 9,999.

 

There are: 495 numbers with AT LEAST two 3 in them. Therefore:

 

The probability is: 495 / 9,000 =5.5% have a repeated digit of 3 in them.

 Nov 15, 2020
edited by Guest  Nov 15, 2020

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