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alexdok [17]
3 years ago
15

It’s me again guys!! Can anyone help me please?

Mathematics
1 answer:
Nikolay [14]3 years ago
4 0
(5-9)^2 - [5-9]
=(-4)^2 - [-4]
=(16) + 4
=20

(two negatives=positive)
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Thuy rolls a number cube 7 times. which expression represents the probability of rolling a 4 exactly 2 times?
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The number of possibilities where 4 appears exactly two times is 5^5*(7!-6!/2).
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6! is the number of permutations of digits 1,2,3,{4,4},5 and 6.
We don't want to subtract all numbers where digits 4 appear side by side. That's why we must divide 6! by 2.

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