Answer:
36
Step-by-step explanation:
The number of two of the nine members of ski patrol unit can be chosen is equal to the combinations of 9 taken 2. This can be calculated using the formula:
[tex]\frac{9!}{2!*(9-2)!}[/tex]
= [tex]\frac{9!}{2!*7!}[/tex], where
9! =9×8×7×6×5×4×3×2×1 and
7!=7×6×5×4×3×2×1
2!=2×1 then the equation becomes:
=[tex]\frac{9*8}{2}[/tex] =36
