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A bag at a fair holds 6 red, 7 green and 8 yellow balls. Without looking, Pinky pulls out one ball. What is the probability that it is yellow?

Competition practiceProbability & Permutation
  • A8/21
  • B8/13
  • C1/3
  • D2/7

Step-by-Step Solution

There are 6 + 7 + 8 = 21 balls and 8 are yellow, so P = 8/21. (8/13 wrongly compares yellow with the non-yellow balls.)
Answer: A) 8/21

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