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### Question

#### The number of non-negative integral solutions of x + y + z n, where n N is -

^{n + 3}C_{3}^{n + 4}C_{4}
^{n + 5}C_{5}
- None of these

^{n + 3}C_{3}^{n + 4}C_{4}^{n + 5}C_{5}#### The correct answer is: ^{n + 3}C_{3}

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