Question

moderator please ans. Let S={2,3,4,5,6,7,9} how many different 3-digit numbers (which are all digits different) from S can be made which are less than 500?​

Answer 1

Answer:

Hope this will help you in your work

Answer 2

The number can be begin with 1,2,3,and 4 not from 5,6,7

So,in first place 4 numbers can be taken.

And for second position -not 7 but any 6 digits can be taken,as repitation is not allowed.

and for third place any 5 digits can be taken,as repitation is not allowed.

So,number of possible integers that can be formed will be=4*6*5

=4*30

=120