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Give correct answer with detailed explanation.....if you don't know the answer then please skip it... 3. How many ways are there to select 5 integers

Give correct answer with detailed explanation.....if you don't know the answer then please skip it...

3. How many ways are there to select 5 integers from {1, ..., 20} such that the difference between any two of the 5 is at least 3? Hint: think about word of length 20 with 5 C for "choose this integer" and 15 R for "reject this integer"

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