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
Reptile [31]
3 years ago
6

Ron finds 9 books at a bookstore that he would like to buy, but he can afford only 5 of them. In how many ways can he make his s

election? How many ways can he make his selection if he decides that one of the books is a must?
a. 3024; 1680
b. 7560; 840
c. 120; 1680
d. 126; 70
Mathematics
1 answer:
olga55 [171]3 years ago
6 0

Answer:

d. 126; 70

Step-by-step explanation:

given that Ron  finds 9 books at a bookstore that he would like to buy, but he can afford only 5 of them.

Out of 9 books he has to select 5 of them

Here selection of books can be done in any order.  Hence order does not matter

No of ways he selects 5 books out of 9 books = 9C5

= 126

Part II

One book is a must

Hence he has options only 4 books from the remaining 8.

No of ways when one book is compulsory = selecting 3 books from 8 books

= 8C4

= 70

Option d is right.

You might be interested in
What is the first step to writing an equation of a line when given two points?
Alisiya [41]
Find the slope of the line using the two points by plugging them into this formula: m = y2 - y1 / x2 - x1 where the two points are x1, y1 and x2, y2 and m is the slope. 
3 0
3 years ago
What is 2.343 rounded to the nearest tenth
elena-s [515]
I'm pretty sure it's 2.3
3 0
3 years ago
Read 2 more answers
How do I solve this question?
Juli2301 [7.4K]

11 because if you count the spaces between the two places, the answer would be 11.

3 0
4 years ago
Read 2 more answers
Line l has equation x = -3. Find the distance between line l and the point (-2,-6).​
Mkey [24]
1, the closest point of x = -3 is (-3,-6), which is one unit away from (-2,-6).
4 0
3 years ago
What survival rate in the 10th year would make the average of loss over the 10 year period equal to 38.0%
Marat540 [252]

Answer: 63%

Step-by-step explanation:

<u>First step</u>

Find the 10th year rate of loss that will make the average of loss over the 10 years to equal 38.0%.

Assume this rate is x;

\frac{(36.2 + 29.0 + 46.2 + 37.5 + 40.9 + 40.0 + 32.6 + 40.5 + 40.1 + x)}{10} = 38.0\\\\\frac{343 + x}{10}  = 38\\\\x  = 380 - 343\\\\x = 37

x = 37%

<u>Second step - Survival rate</u>

The survival rate is calculated by;

= 1 - rate of loss

= 1 - 37%

= 63%

7 0
3 years ago
Other questions:
  • What’s it mean about how angles change when you rotate them?
    11·2 answers
  • ⚠️❗️What is the volume of the regular pyramid below?
    10·2 answers
  • Can somebody answer this question for me?
    11·1 answer
  • Find the gcf for the list. 28y4, 20y3
    12·1 answer
  • 0.00014s in scientific notation? ...?
    7·2 answers
  • An equiangular triangle can be scalene
    13·1 answer
  • There is a bag with only red marbles and blue marbles. The probability of randomly choosing a red marble is 2 9 . There are 63 m
    5·1 answer
  • PLEASE HELP ME I ONLY HAVE A FEW MINUTES LEFTTTT!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!Which of the following are irrational numbers?
    7·2 answers
  • Which of the following is an accurate description of the scatterplot?
    13·2 answers
  • WILL GIVE BRAINLIEST!!!!!!!<br><br> what's 1+1? ;)
    6·1 answer
Add answer
Login
Not registered? Fast signup
Signup
Login Signup
Ask question!