SOLUTION: can you help me solve this question (how many different integers can be expressed as the sum of three different numbers in the set {1,2,3,4,5,6,7}

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Question 640107: can you help me solve this question (how many different integers can be expressed as the sum of three different numbers in the set {1,2,3,4,5,6,7}
Answer by solver91311(24713) About Me  (Show Source):
You can put this solution on YOUR website!


There are 7 ways to choose the first number. Then for each of those ways to choose the first number there are 6 ways to choose the second number. Then for each of those 42 ways to pick the first two numbers, there are 5 ways to pick the third number...

John

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