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Elis [28]
3 years ago
5

Solve: 2x-20/3=2x -5 -3 2 13

Mathematics
1 answer:
emmainna [20.7K]3 years ago
8 0
Unless there are some parentheses in there that we're not seeing, the equation has no solution.
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Answer: C) 0.112

Step-by-step explanation:

In binomial distribution with parameters n (Total trails) and p (probability of getting success sin each trial) , the probability of getting success in x trials is given by :-

P(X=x)=^nC_xp^x(1-p)^{n-x}

Given : The probability of drawing a heart from a standard deck of cards is 0.25

Here , getting heart is the success.

Then p= 0.25

For n= 20

The probability that you will draw a heart seven times i.e. x= 7:

P(X=7)=^{20}C_7(0.25)^7(1-0.25)^{20-7}

P(X=7)=\dfrac{20!}{7!(20-7)!}(0.25)^7(1-0.25)^{20-7}\ \ [\because\ ^nC_r=\dfrac{n!}{r!(n-r)!}]

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Hence, the probability that you will draw a heart seven times = 0.112

Thus , the correct answer is C) 0.112 .

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