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Inverse Operations
Operations that undo each other include: addition and subtraction multiplication and division powers and roots
Inverse Operations: Divison undoes multiplication. Addition undoes subtraction. Subtraction undoes addition. Multiplication undoes division.
The question does not specify how the the digits are to be combined: addition, multiplication, subtraction, division, power, other.
Your question is a little confusing. If you are asking which gets done first ... addition/subtraction or multiplication/division ... the multiplication/division is done first. In other words, in 1 + 4 / 2, you divide 4 by 2 first, then add 1. So the answer is 3.