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Given interchanges : Signs + and - , numbers 4 and 8.

4 + 8 - 12 = 12
4 - 8 + 12 = 0
8 + 4 - 12 = 24
8 - 4 + 12 = 8

Correct Answer: 4 - 8 + 12 = 0

Explanation:

On interchanging + and - and 4 and 8 in (b),

we get the equation as

8 + 4 - 12 = 0
or 12 - 12 = 0
or 0 = 0, which is true.

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