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

Answer 1

Number of possible 2 letter arrangements = 26x25 = 650

BUT, half of those would be in the wrong alphabetical order, e.g.
they would contain rt and tr, one is right the other wrong, so..

number of ways for your problem = 650/2 = 325