1answer.
Ask question
Login Signup
Ask question
All categories
  • English
  • Mathematics
  • Social Studies
  • Business
  • History
  • Health
  • Geography
  • Biology
  • Physics
  • Chemistry
  • Computers and Technology
  • Arts
  • World Languages
  • Spanish
  • French
  • German
  • Advanced Placement (AP)
  • SAT
  • Medicine
  • Law
  • Engineering
lana [24]
3 years ago
7

Probability Question

Mathematics
2 answers:
trapecia [35]3 years ago
8 0

Answer:

39/812

Step-by-step explanation:

The total no. of balls is 6+7+8+9 = 30.

There are 4 possible outcomes that fits "all 3 balls taken are of the same color": 1. all red balls/2.all green balls / 3. all blue balls/4. all white balls. Either one will do. So the required probability is the sum of probability that these 4 outcomes happen.

First lets find the probability of taking out all red balls.

There are total 30 balls, but only 6 are red, so in the first try, the probability of taking out a red ball is 6/30.

In the 2nd time, since you have already taken out one red ball, the no. of red balls left is 5, and the total no. of balls is 29. So the probability of taking out another red ball is 5/29.

This repeats for the 3rd time. The probability of taking out the 3rd red ball is 4/28.

These 3 times all have to happen in order, so the total probability is

6/30 x 5/29 x 4/28

=1/203

Now find the probability of taking out all green balls. The process is same from finding the probability of taking out all red balls, just that replace 6 to 7 instead.

So, the probability of taking out all green balls is

7/30 x 6/29 x 5/28

=1/116

Repeat again for blue balls and white balls.

Probability of taking out all blue balls = 8/30 x 7/29 x 6/28 = 2/145

Probability of taking out all white balls= 9/30 x 8/29 x7/28 =3/145

Now add all 4 fractions up.

1/203 + 1/116 + 2/145 + 3/145

=39/812

By the way, another method is to use combination "nCr". You will also get the same answer.

n: number of items

r: number of items being chosen at a time

(Probability of all red balls + Probability of all green balls + probability of all blue balls + probability of all white balls)÷Total no. of combinations - which is random 3 balls out of 30.

(6C3 + 7C3 + 8C3 +9C3) / (30C3)

= 39/812

strojnjashka [21]3 years ago
5 0

Answer:  

39/812.

Step-by-step explanation:

There are a total of 6+7+8+9 = 30 balls.

Prob(3 red balls are taken) =  6/30 * 5/29 * 4/28 = 1/203

Prob(3 green balls are taken) =  7/30 * 6/29 * 5/28 = 1/116.

Prob(3 blue balls are taken) =  8/30 * 7/29 * 6/28 = 2/145.

Prob(3 white balls are taken) = 9/30 * 8/29 * 7/28 = 4/145.

So the probability of 3 balls od the same colour is the sum of these above probabilities =  39/812.

You might be interested in
I Have A 66 In Math Plz Help
tatiyna

Answer:

A Pythagorean triple consists of three positive integers a, b, and c, such that a² + b² = c². Such a triple is commonly written, and a well-known example is. If is a Pythagorean triple, then so is for any positive integer k. A primitive Pythagorean triple is one in which a, b and c are coprime.

3 0
3 years ago
Read 2 more answers
Evaluate x (5-y) ; use x=6,and y=1​
Aleks04 [339]

Answer:

24

Step-by-step explanation:

x (5-y)

let x=6,and y=1​

6(5-1)

Parentheses first

6(4)

24

5 0
3 years ago
Read 2 more answers
In 1983, a pair of jeans cost $66.35. If a pair of jeans costs $118.10 today, what is the CPI?
Alex73 [517]
Answer choice C
118.10/66.35=1.779 or 1.78
1.78x100=178
3 0
3 years ago
Read 2 more answers
Which statement is always false?
FinnZ [79.3K]

Answer:

All parallelograms are squares

Step-by-step explanation:

Reasoning:

You can have a parallelogram with side lengths, i dont know, 5 and 3, right? That isn't a square :)

8 0
3 years ago
PLEASE HELP QUICK 100 POINTS
MrRissso [65]

Answer:

Change per week: $20

Starting amount of money: $550

Step-by-step explanation:

<u>Given equation</u>:

y=550+20x

where:

  • x = number of weeks
  • y = total account balance

<u>Change per week</u>

As the variable x represents the number of weeks, its coefficient represents the change per week in the amount of money.

Therefore, the change per week in the amount of money in the account is $20.

<u>Initial Balance</u>

The starting amount of money in the account (initial balance) will be the value of y when x = 0:

\implies y=550+20(0)=550

Therefore, the starting amount of money in the account is $550.

4 0
2 years ago
Other questions:
  • Geometry !!! <br><br> True or false question
    10·1 answer
  • In the equation x^2+kx+54=0 one root is twice the other root find k
    7·1 answer
  • Whats the fastest way to figure out equations and inequalitys
    8·1 answer
  • Solve.<br> 4= 45 + 16<br> Please help I mad to finish this today
    7·1 answer
  • Graph the function h(x) = |x| + 4
    6·1 answer
  • Select the equation of the line that passes through the point (3, -1) and is perpendicular to the line on the graph
    7·1 answer
  • Kira received a $1600 bonus. She decided to invest it in a 3-year certificate of deposit (CD) with an annual interest rate of 1.
    5·1 answer
  • Can someone please help me will give brainlist
    5·1 answer
  • what is the relationship between the following two sequence? Sequence 1: 0,1,2,3,4,5 Sequence 2: 0,4,8,12,16, 20
    9·1 answer
  • The chocolate Shoppe has a rectangular logo for their business that measures 2 1/2 feet tall with an area that is exactly the ma
    9·1 answer
Add answer
Login
Not registered? Fast signup
Signup
Login Signup
Ask question!