SOLUTION: Each of the digits​ 0-9 is written on a slip of​ paper, and the slips are placed in a hat. If 2 slips of paper are selected at​ random, determine the probability that the 2nu

Algebra ->  Probability-and-statistics -> SOLUTION: Each of the digits​ 0-9 is written on a slip of​ paper, and the slips are placed in a hat. If 2 slips of paper are selected at​ random, determine the probability that the 2nu      Log On


   

Question 1148158: Each of the digits​ 0-9 is written on a slip of​ paper, and the slips are placed in a hat. If 2 slips of paper are selected at​ random, determine the probability that the 2numbers selected are greater than 5
The problem is to be done without replacement. Use combinations to determine the probability.
Answer by greenestamps(13203) About Me  (Show Source):
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4 of the 10 numbers are greater than 5.

# of ways to choose 2 of the 10 numbers: 10C2
# of ways to choose 2 of the 4 numbers greater than 5: 4C2

P(pick 2 numbers greater than 5) = C%284%2C2%29%2FC%2810%2C2%29+=+6%2F45+=+2%2F15