Answer: d. 10
Step-by-step explanation:
We know that the number of combinations of r objects selected from a group of n objects at a time is given by :-
[tex]^nC_r=\dfrac{n!}{(n-r)!r!}[/tex]
Given : The total number of letters = 5
The number of letters need to select = 2
Then , the number of combinations of 2 letters selected from a group of 5 letters at a time is given by :-
[tex]^5C_2=\dfrac{5!}{(5-2)!2!}=\dfrac{5\times4\times3!}{3!\times2}=10[/tex]
Hence, there are 10 possible selections.
