Three-digit numbers

How many are all three-digit numbers that are made up of digits 0,2,5,7 and are divisible by 9 if the digits can be repeated?

Correct answer:

n =  7

Step-by-step explanation:

s1=2+7+0=9 s2=2+2+5=9  s1 mod9=0 s2 mod9=0  270,720,207,702,225,252,522  n=4+3=7



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