This is a combination problem. Order does not matter and the books are all different. You would write this as 21C5 or $\tbinom{21}{5}$ . Combinations are not fractions.

The answer is $\frac{21 * 20 * 19 * 18 * 17}{1 * 2 * 3 * 4 * 5}$

which = 20349 different ways these books can be chosen.

5 0

3 years ago

Read 2 more answers

ITS A TIMED TEST!!!!! PLEASE HELP!!!!!!!!

dsp73

I believe it is A. Sorry if it’s wrong <3

7 0

3 years ago

1.What is the area of the circles What is the area of the shaded region?

Rama09 [41]

Answer:

47.32 in^2

Step-by-step explanation:

Area rectangle = 21cm * 10.5cm = 220.5 cm^2

Area circle = pi*r^2

= Pi * 5.25^2

=( 86.59 in^2 )*2

= 173.18 in^2

Shaded region. 220.5 - 173.18 = 47.32 in^2

6 0

3 years ago

- What are the odds of winning a game, if the probability of winning the game is 4/10

oksano4ka [1.4K]

Answer:

40%

Step-by-step explanation:

4/10 = 40/100

40/100 as a percentage is 40%

7 0

3 years ago