In the following question, select the number which can be placed at the sign of question mark (?) from the given alternatives.
In each row, the first three numbers from the left end will be added and subtracted by 3 to obtain the fourth number.
Row 1 : (9+11+7)-3 =24
Row 2 : (17+6+4)-3 = 24
Row 3 : (12+12+9)-3 = 30
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