Discussion
Which one of the four interchanges in signs and numbers would make the given equation correct? 3 + 5 – 2 = 4
Answer: C
Correct answer: + and –, 3 and 5
Interchanging the two signs and the numbers 3 and 5 turns \( 3 + 5 - 2 \) into \( 5 - 3 + 2 \), which is 4 as required. Swapping 2 with 3 instead gives \( 2 - 5 + 3 = 0 \), and swapping 2 with 5 gives \( 3 - 2 + 5 = 6 \) - so only the third interchange works.
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