Using the formula for combinations, we have:
C(20, 5) = \frac{20!}{5!(20-5)!} = \frac{20!}{5!15!}
Now, let's calculate the factorial values:
20! = 20 \times 19 \times 18 \times 17 \times 16 \times 15!
5! = 5 \times 4 \times 3 \times 2 \times 1
15! = 15 \times
Show more…