If a, b, and c are three different positive integers less then 10 and greater than 0 , what is the greatest possible value of the expression (a -b)/c?

If a, b, and c are three different positive integers less then 10 and greater than 0 , what is the greatest possible value of the expression (a -b)/c? Correct Answer 7

Let, a = 9b= 2c= 1 So,  (a-b)/c = (9-2)/1 = 7 Here if I take b=1 and c=2 then the value will be (a-b)/c = (9-1)/2 =4 and it Won't be the greatest value  so,  7 Will be the answer. 
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