Three-digit numbers

How many are all three-digit numbers made up of digits 0,2,5,7 and are divisible by nine 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 mod 9 =0 s2 mod 9 =0  270, 720, 207, 702, 225, 252, 522  n=4+3=7



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