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How many three-digit whole numbers have no 7's and no 9's as digits, and are even?

 Nov 29, 2020
 #1
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We have  7  ways  to fill  the hundreds place  [  7, 9 and  0 cannot be used ]

 

Then , we  have 8 ways to fill the  tens  digit  [ 7 and  9 can't be used]

 

Finally we have  5 ways to fill  the  units digit (0, 2,4,6,8 )

 

So

 

7 *  8  *  5    =      280  such numbers

 

cool cool cool

 Nov 29, 2020

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