A bag contains 3 white, 2 blue and 5 red balls. One ball is drawn at random from the bag. What is the probability that the ball drawn is not red?

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CTET July 2019 Paper 2 Maths & Science (L - I/II: Hindi/English/Sanskrit)
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  1. 3/10
  2. 1/5
  3. 1/2
  4. 4/5

Answer (Detailed Solution Below)

Option 3 : 1/2
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Calculation:

A bag contains 3 white, 2 blue and 5 red balls.

Total number of balls = 3 + 2 + 5 = 10

Number of balls that are not red = 10 - 5 = 5

Probability of balls drawn is not red = (number of balls which are not red)/(total number of balls) = 5/10 = 1/2
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