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ser-zykov [4K]
2 years ago
14

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

Mathematics
1 answer:
likoan [24]2 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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Original equation is P=kx^{2}

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Hence, correct option is k=\frac{p}{2x^{2} }.

4 0
2 years ago
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2 years ago
Find a ⋅ b. a = 8i + 6j, b = 4i + 5j
frutty [35]
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7 0
2 years ago
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