In how many ways can 2 students be selected from a group of 5 students in a debating competition?
-
A.
25 ways -
B.
10 ways -
C.
15 ways -
D.
20 ways
Correct Answer: Option B
Explanation
(Inhspace{1mm} ^{5}C_{2}hspace{1mm}wayshspace{1mm}=frac{5!}{(5-2)!2!}\=frac{5!}{3!2!}\=frac{5times4times3!}{3!times2times1}\=10hspace{1mm}ways)