BANK IBPS RRB Clerk 2025 Mock Test Series (Pre + Mains) Quantitative Aptitude Probability

A bag contains 5 red balls, x blue balls, and 7 green balls. If the probability of picking two balls, which are blue balls, is 1/20, then find the total number of balls in a bag.

1

16

2

12

3

18

4

9

5

14

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