Question

how many 2 digit even nipumbers can be formed from the digits 1,2,3,4,5.if the digit can be repeated

Answer 1

For a number to be even its unit digit should be even

Since there are only 2 even numbers(2 and 4) in the given list, so there are 2 ways for unit digit

As digits can be repeated all the 5 digits can be used, therefore there are 5 ways for tens place.

Hence total number of ways is 5×2=10.

[since this is a small problem we can predict the digits. They are 12, 14, 22, 24, 32, 34, 42, 44, 52, 54]