Problem: A Committee is to consist of three members. If there are seven men and five women available to serve on the committee, how many different committee can be formed.?
View all: BANGLADESH KRISHI BANK LTD (OFFICER-CASH) WRITTEN QUESTION (MATH) SOLVE | 2018
Correct Answer: 220 ways.
Explanation:
Here, 3 members is to be included in
Available men = 7 & Available women = 5
so, the combination can be
(i) $^{7}C_{3}x ^{5}C_{0} = \frac{7!}{3!x4!} x \frac{5!}{5!x0!}$ = 35
(ii) $^{7}C_{2}x ^{5}C_{1} = \frac{7!}{2!x5!} x \frac{5!}{1!x4!}$ = 105
(iii) $^{7}C_{1}x ^{5}C_{2} = \frac{7!}{1!x6!} x \frac{5!}{2!x3!}$ = 70
(iv) $^{7}C_{0}x ^{5}C_{3} = \frac{7!}{7!x0!} x \frac{5!}{3!x2!}$ = 10
so, total combination = 35 + 105 + 70 + 10 = 220 ways.