Numbers 72404

How many numbers are less than 200, the digit sum of which is 6?

Correct answer:

n =  13

Step-by-step explanation:

a1=6 a2=15 a3=24 a4=33 a5=42 a6=51 a7=60 a8=105 a9=114 a10=123 a11=132 a12=141 a13=150 n=13



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