Given interchanges :
Signs + and - and numbers 4 and 8.
Option:
A. 4 ÷ 8 - 12 = 16
B. 4 - 8 + 12 = 0
C. 8 ÷ 4 - 12 = 24
D. 8 - 4 ÷ 12 = 8
Answer: B . 4 - 8 + 12 = 0
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Justification:
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.
