Manu uses only the digits 2 and 5 to make different three-digit numbers. For example, 252 and 222 are two possible numbers.
What is the sum of all of Manu's possible three-digit numbers?
For some positive integer k both 4^k and 5^k start with the same digit x in base 10 i.e.
4^k = x.....
5^k = x.....
What is the sum of all possible values of x.
A five-digit number is formed using digits 1,3,5,8 and 9 without repeating any one of them.
What is the sum of all such possible numbers?
There are four solutions.
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