Which two signs should be interchanged in the following equation to make it correct?
$$78 \div 6 \times 4 - 3 + 9 = 10$$
By Trial and Error method,
Option A
$$78\div6\times4+3-9=10$$
$$13\times4+3-9=10$$
$$52+3-9=10$$
$$46=10$$
Hence Option A is incorrect
Option B
$$78+6\times4-3\div9=10$$
$$78+6\times4-\frac{1}{3}=10$$
The value will be decimal after solving which is incorrect
Option C
$$78\div6-4\times3+9=10$$
$$13-4\times3+9=10$$
$$13-12+9=10$$
$$10=10$$
Hence, the correct answer is Option C
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