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muminat
3 years ago
12

Of the 20 flash bulbs in a box, 2 are defective. an inspector will select 2 light bulbs simultaneously and at random from the bo

x. what is the probability that neither of the light bulbs selected will be defective
Mathematics
1 answer:
Shkiper50 [21]3 years ago
4 0

|\Omega|=C(20,2)=\dfrac{20!}{2!18!}=\dfrac{19\cdot20}{2}=190\\
|A|=C(18,2)=\dfrac{18!}{2!16!}=\dfrac{17\cdot18}{2}=153\\\\
P(A)=\dfrac{153}{190}\approx81\%

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A line passes through the point (-2, 7) and has a slope of -5.
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Answer:

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Step-by-step explanation:

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Graph the line -1 passing through the point (-4,5)​
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Answer:

Step-by-step explanation:

If you want to find the equation of line with a given a slope of which goes through the point (-4,5), you can simply use the point-slope formula to find the equation:

---Point-Slope Formula---

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Plug in , , and (these values are given)

Distribute  

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Little Snail is going to visit his friend over at the next pond, 3 miles away. He can crawl ( 1/2. 1/3, 1/4, 3/4, 2/3 ) of a mil
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Solution :

It is given that Little Snail is going to visit one of his friend at the pond which is 3 miles away.

When the snail crawls 1/2 of a mile per day, it will take him, $1 \times \frac{2}{1} \times 3$

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When the snail crawls 1/3 of a mile per day, it will take him, $1 \times \frac{3}{1} \times 3$

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When the snail crawls 1/4 of a mile per day, it will take him, $1 \times \frac{4}{1} \times 3$

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When the snail crawls 3/4 of a mile per day, it will take him, $1 \times \frac{4}{3} \times 3$

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When the snail crawls 2/3 of a mile per day, it will take him, $1 \times \frac{3}{2} \times 3$

   =  4.5 days to get to the next pond.

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3 years ago
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