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erastovalidia [21]
3 years ago
5

James has 2 marbles. His friend gives him 3 marbles. which two doubles facts can you use to find out how many marbles James has

now
Mathematics
1 answer:
timofeeve [1]3 years ago
3 0
You could add 2+3=5thats so easy
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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).
 5^5 is the number of 5-digits numbers composed of digits 1,2,3,5 and 6 so that digits can repeat.
7! is the number of permutations of digits 1,2,3,4,4,5 and 6.
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.

Finally, the probability is P=5^5(7!-6!/2)/7^7
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Step-by-step explanation:


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