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  9. Q58

ibps-rrb-os1 2017 · Question 58 of 74

A bag contains 6 Red, 5 Green and 4 Yellow coloured balls. 2 balls are drawn at random after one another without replacement then what is the probability that atleat one ball is Green.

Quantitative Aptitude (misc)

  1. A2 3
  2. B4 5
  3. C3 8
  4. D4 7Correct
  5. E2 7

Answer: D. 4 7

Explanation

Probability that no ball is green 𝐶 10 1× 𝐶1 9 15×14 = 90 15×14 = 3 7 Required probability = 1 − 3 7 = 4 7

Source: IBPS RRB PO Prelims 2017 Memory Based Paper (Adda247) · memory-based

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