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How many nonnegative integer solutions of (x+y+z=10) have each variable not greater than (5)?

Answer and explanation

Correct answer: (21)

From total ( \binom{12}{2} ), subtract (3\binom{6}{2}) cases where a variable is (6) or more, giving (21). For upper bounds, complementary counting is useful.

Related tags

Class11CombinationsUpper-BoundInteger-SolutionsExpertPermutations And CombinationsMathematicsClass 11 Mcq

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