How many 5-letter words can we make if the letters are in order? Using the $26$ English letters, the number of $5$-letter words that can be made if the letters are distinct is determined as follows:
$26P5=26\times25\times24\times23\times22=7893600$ different words.

What if the letters in each word are in alphabetical order?

For example, the word JLOQY is valid, but the word JUMPY is invalid since U can not be before M

Divide out the number of permutations of five letters ($5!$), since only one is correct. 
