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binary 0 1
5+10+10 5+5+5+10 5+5+5+5+5 5+20 Four ways.
there are 5 ways
The number of ways is 18C5 = 18!/(5!*13!) = 8,568 ways.
Two ways: 5/5 = 1 and 5/1 = 5 because 5 is a prime number which has only 2 factors which are itself and one