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Grade 9IIT JEE Entrance Exam

If a bag contains 15 marbles, 3 yellow, 4 white, and 8 blue marbles, how many samples of 2 can be drawn in which both marbles are blue?

Akansha

11 Years agoGrade 9

4 Answers

Vikas TU

Approved Tutor Answer11 Years ago

The question is "how many samples of 2 can be drawn in which both marbles are blue?" The question is not "what is the probability." We are also not counting any draw in which either one or both marbles are NOT blue. The answer to the question is simply 8 choose 2 or 8!/[2!(8!-2!)] or 28 combinations are possible in which both marbles are blue.

Akansha

11 Years ago

thankyou

TEJKIRAT SINGH

Approved Tutor Answer11 Years ago

The question is "how many samples of 2 can be drawn in which both marbles are blue?" The question is not "what is the probability." We are also not counting any draw in which either one or both marbles are NOT blue. The answer to the question is simply 8 choose 2 or 8!/[2!(8!-2!)] or 28 combinations are possible in which both marbles are blue.

sajid

11 Years ago

The answer to the question is simply 8 choose 2 or 8!/[2!(8!-2!)] or 28 combinations are possible in which both marbles are blue

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