Mr and Mrs Zimmerman want to give their baby a name so that the baby's 3 initials are in alphabetical order.all i can think of is that there are 26 letters in the alphabet and 26 choose 3 = 2600, but how many of these groups of 3 letters are in alphabetical order?

how many different initials could the baby end up with? (for example B,G,Z is acceptable but G,B,Z is not etc.)