Question

How many different ways can teams of fourmembers be formed from a class of 20 students?1) 5 2) 80 3) 4,845 4) 116,280

Answer 1

`\begin{gathered} \text{This is simply given as } \\ ^(20)C_4^{} \\ \text{This means selecting 4 students at a time out of 20 } \end{gathered}`