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kvv77 [185]
3 years ago
8

There are 31 fish in a tank.there are 3 more blue fish than green fish.how many blue fish is there

Mathematics
1 answer:
Nostrana [21]3 years ago
8 0
Ithink the answer is 4
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<u>Complete Question</u>

The usher at a wedding asked each of the 80 guests whether they were a friend of the bride or of the groom. The results are: 59 for Bride, 50 for Groom, 30 for both. Find the probability that a randomly selected person from this sample was a friend of the bride OR of the groom.

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Step-by-step explanation:

Total Number of Guests, n(S)=80

Let the Event (a friend of the bride) =B

Let the Event (a friend of the groom) =G

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Therefore:

n(B \cup G)=n(B)+n(G)-n(B \cap G)\\n(B \cup G)=59+50-30\\n(B \cup G)=79

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Therefore:

The probability that a randomly selected person from this sample was a friend of the bride OR of the groom.

P(B \cup G) =\dfrac{n(B \cup G) }{n(S)} \\\\=\dfrac{79 }{80}\\\\=0.9875

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