HELP ME
Liam is buying books for his summer reading collection. He has narrowed his choices down to 7 books and is planning to purchase 3. How many combinations exist? A) 18 B) 35 C) 78 D) 120

B. 35

Step-by-step explanation:

nCr = n! /(n-r)!r!

7C3 = 7!/(7-3)!3!

7! = 7x6x5x4x3x2x1 = 5040

(7-3)! = 4! = 4x3x2x1 = 24

3! = 3x2x1 = 6

Therefore,

7C3 = 5040/(24x6)

= 5040/144 = 35

No. of combinations =

3!=3×2×1

answer: i think it's a

step-by-step explanation:

answer

the correct answer is

explanation

the given function is

the excluded values are obtained by solving:

we factor to obtain:

the excluded values are