Given interchanges: Sign - and + and numbers 8 and 4

4 + 8 - 1 = 5

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4 - 8 + 5 = 9

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4 + 8 - 5 = 10

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4 - 8 + 12 = 1

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Solution

The correct option is A 4 + 8 - 1 = 5
On interchanging - and + and 8 and 4 we get the equation (a) as
8 - 4 + 1 = 5 or 4 + 1 = 5 which is true

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