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What smallest number must be added to 269 to make it a perfect square?

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answer is D.

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Detailed Solution

Concept- In order to do this, we will locate the closest perfect square, which is just bigger than

269 .

The closest perfect square, 289, which is generated from the number 7, is known to us.
. Since we must calculate the number that must be added, we shall subtract 269 from

289,

giving us the result

289 - 269 = 20 .

As a result, choice 4 is the best one.

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