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Question

How many ways can the number 30 be written as an ordered sum of 2s and 5s?
12 years ago

Answers

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
12 years ago

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