Question

Can I get help in #5 ? I don’t get it

Answer 1

Step 1

The selection formula is;

$\begin{gathered} ^nc_r=\frac{n!}{r!(n-r)!} \\ n=10 \\ r=5 \end{gathered}$$=\frac{10!}{5!(10-5)!}=\frac{3628800}{120(120)}=252\text{ groups}$

Answer; 252 groups