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  9. Q8

ibps-rrb-oa 2017 · Question 8 of 56

An urn contains 6 red, 4 blue and 2 green balls. 3 balls are picked at random, find the probability that all the 3 balls are of same colour.

  1. A(a) 55/6
  2. B(b) 6/5
  3. C(c) 11/5
  4. D(d) 2/5
  5. E(e) None of theseCorrect

Answer: E. (e) None of these

Explanation

Required probability=(6C3+4C3) ÷ (12C3)=6/55

Source: IBPS RRB Office Assistant Prelims 2017 Paper (with Answers & Solutions) - Examrace · memory-based

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