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1. ${}^{n}C_{2} + {}^{n}C_{3} +^{n + 1} C_{4}$

A. ${}^{n}C_{4}$
B. ${}^{n}C_{4}$
C. ${}^{n}C_{4}$
D. ${}^{n}C_{4}$

Answer: Option C

Explanation:

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