A 4-digit Number 35y6 is divisible by 3. What are the possible values of y?
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the sum of all the face values of a number if divisible by three are factors of 3
hence: sum of 3,5,6=14
1= 14+1=15 possible
2=not possible
3=not possible
4=possible
5=not possible
6=not possible
7=possible
8=not possible
9=not possible
hence: the possible numbers are: 1, 4, 7
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