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The answer choices tell us that the 3 radicals (square root expressions) can probably all be rewritten as EITHER 3 times some integer OR 6 times some integer. Since 1323 is ODD, we know that we can't rewrite it as 6 times some integer. So, let's rewrite each expression as 3 time some integer.

√1323 + √588 + √243 = √(441 x 3) + √(196 x 3) + √(81 x 3)

Now we'll apply a nice rule that says: √(ab) = (√a)(√b)

= (√441)(√3) + (√196)(√3) + (√81)(√3)

√441 is a tough one to evaluate. However, if we recognize that √400 = 20, then perhaps √441 = 21. A quick check (21² = 441) confirms this. √196 is a little easier. we might already know that √225 = 15, so we might check whether √196 = 14 A quick check (14² = 196) confirms this. Finally, we should know that √81 = 9

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