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Which of the following numbers are perfe...

Which of the following numbers are perfect squares ? 11, 12, 16, 32, 36, 50, 64, 79, 81, 111, 121

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`16` is a perfect square of `4`
`36` is a perfect square of `6`.
`64` is a perfect square of `8`.
`81` is a perfect square of `9`.
`121` is a perfect square of `11`.
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