SOLUTION: How many three-digit numbers have the sum of their digits equal to 20? This is a homework problem for me and I am simply stumped. we are working on permutations, factorials and

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Question 243582: How many three-digit numbers have the sum of their digits equal to 20?
This is a homework problem for me and I am simply stumped. we are working on permutations, factorials and trees.
Thank you!!
Answer by checkley77(12844) About Me  (Show Source):
You can put this solution on YOUR website!
I count 36.
992=20
983=20
974=20
965=20
956=20
947=20
938=20
929=20
893=20
884=20
875=20
866=20
857=20
848=20
839=20
794=20
785=20
776=20
767=20
758=20
749=20
695=20
686=20
677=20
668=20
659=20
596=20
587=20
578=20
569=20
497=20
488=20
479=20
398=20
389=20
299=20