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In a three-digit number, the hundreds digit is greater than 5, the tens digit is greater than 4 but less than 8, and the units digit is the smallest prime number. How many three-digit numbers satisfy all of these conditions?

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tlin0611  Dec 25, 2017
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The hundreds column can be  6,7,8,or 9.   That is 4 possibilies

the tens column can be 5,6,or 7  that is 3 possibilities.

The unit column has to be 2, only one possibility

 

so there are   4*3*1 =        12 possible numbers

Melody  Dec 25, 2017

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