Evaluate each of the following without directly expanding factorials

MATHEMATICS · Subjective · CBSE · Mathematics · Binomial Theorem · Binomial Theorem

Problem

Evaluate each of the following without directly expanding factorials. (a)

{}^{12}C_{4}+{}^{12}C_{5}

(b)

{}^{9}C_{3}+{}^{9}C_{4}

{}^{15}C_{7}+{}^{15}C_{8}