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From (4) types of fruits, (6) fruits are to be selected, with unlimited quantity of each type. How many selections are possible?

Answer and explanation

Correct answer: (84)

This is the number of nonnegative solutions of (x_1+x_2+x_3+x_4=6), so ( \binom{9}{3}=84 ). For unlimited identical types, use stars and bars.

Related tags

Class11CombinationsMultisetStars-And-BarsExpertPermutations And CombinationsMathematicsClass 11 Mcq

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