campus placement Tech Mahindra Test Series Quantitative Aptitude Permutation and Combination

The number of non-negative integral solutions of x1 + x2 + x3 + x4 ≤ n (where n is a positive integer) is:

1
\(n + {2_{{C_3}}}\)
2
\(n + {4_{{C_4}}}\)
3
\(n + {4_{{C_3}}}\)
4
\(n + {3_{{C_3}}}\)
5
None of these
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