The answer is -1.

Explanation:

1 - 2 = -1 (subtraction) 3 - 2 = 1 (subtraction) -1 * 2 = -2 (multiplication) 4 / 2 = 2 (division)

Out of all the operations, only subtraction and multiplication can yield a result that is not equal to two.

The only values that can be used in these operations to get a result that is not equal to two are 1 and 3.

The result of subtracting 1 from 2 is -1 and the result of multiplying -1 and 2 is -2.

Since the question asks for a singular answer, the only valid response is -1.
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