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Mathematics - Permutation & Combination Question with Solution | TestHub

MathematicsPermutation & CombinationnPr & nCrMedium2 minPYQ_2020
MathematicsMediumnumerical

An urn contains5red marbles,4black marbles and3white marbles. Then, the number of ways in which4marbles can be drawn so that at the most three of them are red is ___________.

Answer:
490.00
Solution:

We have,5  red,4 black, 3 white marbles
Required number of ways 

=C05×C47+C15×C37+C25×C27+C35×C17   

=35+175+210+70

=490

Stream:JEESubject:MathematicsTopic:Permutation & CombinationSubtopic:nPr & nCr
2mℹ️ Source: PYQ_2020

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