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Ans 2:
Class : Class 9
answer is 3 as the centre no. has to be 0 otherwise the number will never be divisible by 0. Also from 0 - 9, 0,3,6 and 9 are the only ones divisible by 3 but 0 cannot be the value of A hence the values could 3, 6 or 9. So the answer is 3
÷ 3 [17 + 3 × 4 - (2 × 7)] + 20 - 2(5 - 4) × {3 - (5 - 3)}.