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Fantom [35]
3 years ago
10

Please Please someone help me, Please

Mathematics
1 answer:
Lubov Fominskaja [6]3 years ago
7 0
Hello,
8*<-5,-9>-2*<6,8>=<-40,-72>+<-12,-16>=<-52,-88>
=====================================
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Answer:

1/4

Step-by-step explanation:

Let's denote the probabilities as following:

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Probability that a selected teenager has a sister also has a brother, or in other words, he/she has a brother, given he/she had a sister:

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Let's apply the formula of conditional probability to work out P(B|A)

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