Which two signs should be interchanged to make the following equation correct?
$$20 \div 20 + 20 - 25 \times 25 = 419$$
As per the given question,
$$20 \div 20 + 20 - 25 \times 25 = 419$$
Now, from the given options, applying hit and trial method,
$$\Rightarrow 20 \times 20 + 20 - 25 \div 25 = 419$$
$$\Rightarrow 20 \times 20 + 20 - 1 = 419$$
$$\Rightarrow 400 + 20 - 1 = 419$$
$$\Rightarrow 420 - 1 = 419$$
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