Q. 29

Using the digits

Answer :

We need to find 3 digits even number using 1,2,3,4,5,6,7


So, units place can have 2,4,6


Number of even numbers if 2 is at unit place


As 2 is fixed next two places can be filled in 5P2 ways




= 20


Similarly, if 4 will be at unit place, 3-digits number will be 20.


Also, if 6 will be at unit place, 3-digits number will be 20.


So, total 3-digits number will be 20+20+20 = 60


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