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Class 10
Mathematics
Probability
a jar contains 24 marbles some are green and othe...

Question:
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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Question:
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.

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Question: 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.

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Question:
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.