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43. Number of non-negative integral solutions of x + y + z + w ≤ 20 is A. 24C4 B. 19C4 C. 20C4 D. None of these

Answer» 43. Number of non-negative integral solutions of x + y + z + w ≤ 20 is A. 24C4 B. 19C4 C. 20C4 D. None of these


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