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thaliavernazaa
23.09.2019 •
Mathematics
An urn contains 7 red marbles and 3 white marbles. three marbles are drawn from the urn one after the other. find the probability that the first two are red and the third is white.
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Ответ:
7+3 = 10 total marbles
1st pick = 7/10 for a red one
2nd pick = 6/9 reduces to 2/3 for a red one
3rd pick = 3/8 for a white one
7/10 x 2/3 =14/30 reduces to 7/15
7/15 x 3/8 = 21/120 reduces to 7/40
probability = 7/40
Ответ:
Answer
Step-by-step explanation:
58 is your answer but to get the answer what you need to do is or,
98
100
× x = 49
Multiplying both sides by 100 and dividing both sides by 98,
we have x = 49 ×
100
98
x = 50
If you are using a calculator, simply enter 49×100÷98, which will give you the answer.