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An urn contains 5 red marbles, 4 black marbles and 3 white marbles. Then the number of ways in which 4 marbles can be drawn so that at the most three of them are red is _________. (in integers)
Correct answer is '490'. Can you explain this answer?
Verified Answer
An urn contains 5 red marbles, 4 black marbles and 3 white marbles. Th...
Required number of ways = Total - (All selected marbles are red)
= 12C4 - 5C4
= 495 - 5 = 490
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An urn contains 5 red marbles, 4 black marbles and 3 white marbles. Then the number of ways in which 4 marbles can be drawn so that at the most three of them are red is _________. (in integers)Correct answer is '490'. Can you explain this answer?
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