Ask question

Ask question

All categories

2 years ago

7

There are 9 balls in a hat .The balls are numbered 1-9 you need to choose 3 of the balls . How many possible combinations are th

ere

1 answer:

Virty [35]2 years ago

3 0

Answer:

84

Step-by-step explanation:

Combinations

nCr

n (objects) = 9

r (sample) = 3

9C3

n! / r! (n – r)!

9! / 3! (9 – 3)!=

9! / (3! * 6!)=

9*8*7*6!/ (3! * 6!)=

6! cancels out

9*8*7/3*2*1=

3*4*7=

12*7=

84

You might be interested in

How do I find the derivative of 2(f(x)+g(x))?

kramer

$\bf 2[f(x)+g(x)]\implies 2f(x)+2g(x)\implies 2\cfrac{df}{dx}+2\cfrac{dg}{dx}\\\\
-------------------------------\\\\
\cfrac{1}{2}\left[ f(x)\cdot g(x) \right]\implies \cfrac{1}{2}\left[ \stackrel{product~rule}{\cfrac{df}{dx}\cdot g(x)+f(x)\cdot \cfrac{dg}{dx}} \right]
\\\\\\
\cfrac{1}{2}\cdot \cfrac{df}{dx}\cdot g(x)+\cfrac{1}{2}\cdot \cfrac{dg}{dx}f(x)$

8 0

4 years ago

Read 2 more answers

So far, you have completed 42 of the 50 multiple choice questions on a test. What percent of test is completed?

BigorU [14]

Answer:

84%

Step-by-step explanation:

if 50(2)=100 then 42(2)=84

7 0

3 years ago

Find the possible value or values of n in the quadratic equation 2n2 – 7n + 6 = 0

qaws [65]

2n^2-7n+6=0

2n^2-4n-3n+6=0

2n(n-2)-3(n-2)=0

(2n-3)(n-2)=0

n=3/2, n=2

4 0

3 years ago

Read 2 more answers

What is the ratio of 30 to 66 in simplest form

Lena [83]

5.11!!!!! -Skyler Scar.

6 0

3 years ago

Which description best describes the solution to the following system of equations?

Olenka [21]

Y = -x + 4
y = 3x + 3

3x + 3 = -x + 4
3x + x = 4 - 3
4x = 1
x = 1/4

y = 3x + 3
y = 3(1/4) + 3
y = 3/4 + 3
y = 3/4 + 12/4
y = 15/4

solution is (1/4,15/4)

so line y = -x + 4 intersects the line y = 3x + 3 at (1/4,15/4)

6 0

3 years ago