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Ulleksa [173]
3 years ago
11

20. Three cards are selected form a standard deck of cards and not

Mathematics
1 answer:
frozen [14]3 years ago
6 0

We have a probability of  \frac{13}{52}=\frac{1}{4} for the first card to be a diamond. Having drawn this first card <em>without replacement,</em> there are now 12 diamonds remaining in a deck of 51 cards, so the probability that the second card is a diamond, given that the first card was a diamond, is \frac{12}{51}=\frac{4}{17}. Similarly, for the third card, there are 11 diamonds in a deck of 50, so the probability of drawing a third diamond is \frac{11}{50}. Now, since these events are dependent, we multiply these three probabilities to get our answer of \frac{11}{850}.

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PLSSSSSS HELP <br> BRAINLIST
Helga [31]

Answer:

The step 4 is not what he should have done. But the wrong is step 5, because if he added -2x both sides, it would give the following equation:

x-12=-4x+6

and not x-12=6

Note that in step 4 he should have added 2x and not -2x to both sides, but we still have the equality. The problem is that step 5 is totally wrong.

I don't know what answer is expected to this question, but I would mark step 5, because this is mathematically wrong.  

Solving the equation

3(x-4)=-4-2(x-5)

Using distribution

3x-12=-4-2x+10\\3x-12=-2+6

Add 2x both sides

3x-12+2x=-2x+6+2x

5x-12=6

Add 12 both sides

5x-12+12=6+12\\5x=18

Divide both sides by 5

$x=\frac{18}{5} $

4 0
3 years ago
PLEASE HELP ASAP! NO JOKE OR SCAM ANSWERS!! FULL ANSWERS ONLY!!!
vladimir2022 [97]

Answer:

A) 991=43x+475

B) 12 hours

Step-by-step explanation:

7 0
3 years ago
A clothing company produced 600 items of clothing. Of those, 15% were jackets, 25% were dresses, and 15% were shoes. How many of
Volgvan

Answer:

270 items

Step-by-step explanation:

3 0
3 years ago
Read 2 more answers
What does the word “flip” tell you to do in “keep change flip” for dividing fractions a) change the place of the numbers numerat
mars1129 [50]

Answer:

b) change the places of the numbers in the numerator and the denominator for the second fraction

Step-by-step explanation:

In the phrase "keep change flip":

You "keep" the first fraction.

"Change" the division sign into a multiplication sign.  

"Flip" (or switch) the places of the numerator and denominator in the second fraction.

Example:

\frac{1}{2} ÷ \frac{1}{3}

\frac{1}{2}*\frac{3}{1}=\frac{3}{2}=1.5

Hope this helps.

7 0
3 years ago
The average person blinks about 360 times in 30 minutes. About how many times does a person blink in 9 minutes?
PilotLPTM [1.2K]

360 blinks / 30 minutes = 12 blinks per minute

12 blinks per minute x 9 minutes = 108 blinks

Answer: 108

4 0
3 years ago
Read 2 more answers
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