math
posted by 000 .
How many ways can the number 30 be written as an ordered sum of 2s and 5s?

math 
MathMate
15 2's = one way
10 2's + 2 5's = 12!/(10!2!) ways
5 2's + 4 5's = 9!/(5!4!) ways
6 5's = one way
Total=194
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