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Two numbers are randomly selected without replacement from the first 20 positive integers. Find the probability that the sum of these two numbers is 17.

 Oct 5, 2020
 #1
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20 c 2 = 190 ways to select 2 numbers

 

1 16

2 15

3 14

4 13

5 12

6 11

7 10

8 9                  8 ways to add to 17     8 out of 190 = 8 /190 = 4/95

 Oct 5, 2020

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