Class 10 Mathematics Probability: NCERT Solutions for Question 5

This page offers a step-by-step solution to the specific question NCERT Class 10th Mathematics - Probability | a jar contains 24 marbles some are green and othe Answer from NCERT Class 10th Mathematics, Chapter Probability.
Question 5

A jar contains 24 marbles, some are green and others are blue. If a marble is drawn at random from the jar, the probability that it is green is 2/3. 

Find the number of blue balls in the jar.

Answer

                 Total no of marbles in the jar (green + blue) = 24

                  Let the no of green marbles be = x

                 Therefore, no of blue marbles left = 24 – x 

                  P(E) of marble to be green = 2/3    {Given} …....(I)

                  Acc. to question

                  P(E) of green marble = x/24        …..........(ii)

                  Equating equation (I) and (ii)

                  2/3 = x/24

                  x = 16

                  No of green marbles = 16

                 Hence, no of blue marbles = 24- 16 = 8

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