What will come in place of the question mark (?) in the following questions?
$$\sqrt{20164} = ?$$
Here, as we can see that unit digit of all the options are different.
So when digit 2 is at unit place in any number then the square of such number will result in 4 at unit place and hence the only option left for verification is 142.
142 x 142 = 20164.
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