30. 72 - [3 - {18 - 19 - 2}} x {1 + 5 of 7 - (3 - 1) a) 1820 b) 130 c) 140 d) 20
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225 225 5 multiply 5 multiply 9 s 175 5 x 5 multiply 7 third 125 ja 5 multiply 5 multiply 5
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