Question

How many 2 digit even number can be formed from the digit 1234 and 5 if the digit can be repeated

Answer 1

You mean 1,2,3,4 and 5?
Then the possible combinations of the digits would be:
12, 14, 22, 24, 32, 34, 44, 42, 52 and 54.

So, about ten number are possible.