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ser-zykov [4K]
3 years ago
14

How many sets of 7 questions can be chosen from a file of 25 questions?

Mathematics
1 answer:
likoan [24]3 years ago
3 0
If all 25 questions are different,

When order of selection counts:
P(25,7)
=25!/(25-7)!
=15511210043330985984000000/6402373705728000
=2422728000

When order of selection does not count count:
C(25,7)
=25!/(7!*(25-7)!)
=15511210043330985984000000/(6402373705728000*5040)
=480700

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Step-by-step explanation:

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2 years ago
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Step-by-step explanation:

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3 years ago
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nydimaria [60]
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4 0
3 years ago
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5 0
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