Answer:
Answer: B. 5
Step-by-step explanation:
Combination
It's a selection of items from a collection, such that the order of selection does not matter.
It can be calculated by using factorials with the formula:
[tex]\displaystyle _mC_n=\frac{m!}{(m-n)!\ n!}[/tex]
Let's calculate:
[tex]\displaystyle _5C_1=\frac{5!}{(5-1)!\ 1!}[/tex]
[tex]\displaystyle _5C_1=\frac{5!}{(4)!\ 1!}[/tex]
Since 5!=5*4! and 1!=1:
[tex]\displaystyle _5C_1=\frac{5*4!}{(4)!\ 1!}[/tex]
Simplifying:
[tex]\displaystyle _5C_1=\frac{5}{1}=5[/tex]
Answer: B. 5
