RD Sharma Solutions Class 10 Mathematics Solutions for Probability Exercise 13.1 in Chapter 13 - Probability

Question 70 Probability Exercise 13.1

A bag contains 5 red, 8 white and 7 black balls. A ball is drawn at random from the bag. Find the probability that the drawn ball is red or white.



The probability of any event occurring is defined as the ratio of favorable outcomes to all possible outcomes.

Total number of possible outcomes = 20 (5 red, 8 white & 7 black}

Let E = event of drawing a red or white ball

No. of favourable outcomes = 13 (5 red + 8 white)

Probability, P(E) = Number of favourable outcomes/ Total number of outcomes

P(E) = 13/20

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