SOLUTION: A container has 7 slips of paper numbered 1, 2, 3, 4, 5, 6, 7. Two different slips of paper are chosen at random from these seven slips. Find the probability that (a) both slips

Algebra ->  Probability-and-statistics -> SOLUTION: A container has 7 slips of paper numbered 1, 2, 3, 4, 5, 6, 7. Two different slips of paper are chosen at random from these seven slips. Find the probability that (a) both slips       Log On


   

Question 932423: A container has 7 slips of paper numbered 1, 2, 3, 4, 5, 6, 7. Two different slips of paper are chosen at random from these seven slips. Find the probability that (a) both slips contain an odd number (b) add to 9
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Answer by ewatrrr(24785) About Me  (Show Source):
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7 slips of paper numbered 1, 2, 3, 4, 5, 6, 7
4Odd. 3 Even
2 slips add to nine: 2,7 & 3,6 & 4,5
.......
2 drawn (w/o replacement: 7C2 = 21 possible pairs
P(both odd) = %284%2F7%29%283%2F6%29
P(add to 9) = 3/21 = 1/7