Sagot :
Answer:
40320 ways
Step-by-step explanation:
There are 10 lucky winners.
If the 1st and last place is already determined who, then...
1 × 8 × 7 × 6 × 5 × 4 × 3 × 2 × 1 × 1
8 × 7 × 6 × 5 × 4 × 3 × 2 × 1
56 × 6 × 5 × 4 × 3 × 2 × 1
336 × 5 × 4 × 3 × 2 × 1
1680 × 4 × 3 × 2 × 1
6720 × 3 × 2 × 1
20160 × 2 = 40320 ways