9514 1404 393
Answer:
- 47129212243960 ≈ 4.713×10^13 if order doesn't matter
- 114660755112113373922453094400000 ≈ 1.147×10^32 if it does
Step-by-step explanation:
If order doesn't matter, the number is the combinations of 50 things taken 20 at a time:
50C20 = 47129212243960 ≈ 4.713×10^13
If order does matter, then the number of ways is this value multiplied by 20!:
50P20 = 114660755112113373922453094400000 ≈ 1.147×10^32
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nCk = n!/(k!(n-k)!)
nPk = n!/(n-k)!
