2 x 5, 10, 20, A...............expression is a combination of numbers and at least one operation , Numerical , 2 Addition , 7^2, 44, 49, 30 divided by 5, 6, 10, 4+4+4+4+4, 50, 20, 7+2+7+2+2, 30, 20, 9x6, 47, 54, 67, 72 divided by 9, 7, 6, 8, Serina doubled her saving account balance of 100 dollar. Then she withdrew 30 dollar to buy some new clothes. What is the correct numerical expression? , 2x100_30, 100_30x3, 2x30_100.

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