How many 3 digit numbers can you find whose digits have a sum of 4.
112 211
103 301 310 013 031
202 220 022
400
how about 130 and 121 ?
I would not count those starting with 0
e.g. 031 is a 2 digit number
112 211
103 301 310 013 031
202 220 022
400
I would not count those starting with 0
e.g. 031 is a 2 digit number