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23 September, 04:37

There are 9 yellow and 4 purple balls in a bag. If you randomly choose balls one at a time, with replacement, what is the probability of choosing 1 yellow ball and then 2 purple balls?

165/5210

24/1329

144/2197

28/1335

+3
Answers (1)
  1. 23 September, 05:07
    0
    9+4 = 13 total balls

    1st pick would be 9/13 probability of picking yellow

    2nd pick would be 4/13 probability

    3rd pick would be 4/13 probability

    total probability : 9/13 * 4/13 * 4/13 = 144/2197
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