Which of the following is a perfect square of an even number?
144
Write each number as a square:
81 = 9²
144 = 12²
121 = 11²
169 = 13²
Only 12 is an even number among 9, 11, 12 and 13.
So 144 is the perfect square of an even number. (The square of an even number is always even, and 144 is the only even number here.)
Hence, 144.
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