Question

How many 2-letter "words" consist of two different letters arranged in alphabetical order? (Any two letters together is considered a "word.")

Answer 1

Should it be arranged in alphabetical order?

Answer 2

like ab, bc, cd and so on?

Answer 3

Question is really confusing.

Answer 4

with a you get 25
with b you get 24
with c you get 23


with y you get 1
with z you get 0
So you get
1+2 +3 + .... +25= 25(26)/2=325