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**dipsy34** Well, on to the problems. In one problem I got a 16 letter long word and want to find out how many strings of length 16 I can create out of this word. Some letters apear multiple times in the word. The word I have is schoolmistresses.

In another problem I got the equation x+y+5z+w=15 and I got to find out how many solution this equation got. I'm not sure how to do this in itself and especially not with the conditions : x; y; z and w are non-negative integers and we also have that x is positive?