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3 years ago

What is the formula for combinations

1 answer:

6 0

Note: , where nPr is the formula for permutations of n objects taken r at a time.Example:How many different committees of 4 students can be chosen from a group of 15?Answer:There are possible combinations of 4 students from a set of 15.There are 1365 different committees

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Every person has blood type O, A, B, or AB. A random group of people are blood-typed, and the results are shown in the table.

vova2212 [387]

The probability that a randomly chosen person from this group has type B is 3/25

The probability that a randomly chosen person from this group has type AB is 1/25

The probability that a randomly chosen person from this group has type B or type AB blood is 4/25

8 0

3 years ago

Read 2 more answers

Which of the following linear equations represents the data chart?

BlackZzzverrR [31]

Answer: y = -x + 7

Step-by-step explanation:

The slope is $\frac{5-6}{2-1}=-1$ , so we know the equation is of the form $y=-x+b$ .

Substituting in the coordinates (1,6) to find b,

$6=-1+b\\\\b=7$

Thus, the equation is y = -x + 7

4 0

2 years ago

everyday Penelope jogs three laps around the playground to keep in shape the playground is rectangular with the width of 163 m a

Veronika [31]

Answer:

The total amount of meters in one lap is 966

Step-by-step explanation:

we know that

The total amount of meters in one lap is the same that the perimeter of the rectangular playground

The perimeter of the rectangular playground is equal to

$P=2(L+W)$

we have

$L=320\ m\\W=163\ m$

substitute

$P=2(320+163)$

$P=966\ m$

3 0

3 years ago

The first term in the sequence below is 2.

Art [367]

-7n + 9 because the common difference is -7, so you have -7n, and then by plugging in the term numbers and the values, you find out that you need to add 9 to the -7n, so the answer is -7n + 9

3 0

3 years ago

What is the slope intercept form of y + 1 = -2 (x-1)?

Mars2501 [29]

Y+1 = -2x+2 (distribute)
Y=-2x + 1 (isolate y)

4 0

3 years ago

Read 2 more answers