What is the simplified form of the following expression? 2 square root of 27 plus square root of 12 minus 3 square root of 3 minus 2 square root of 12

Simplify the radicals first: √27 = 3√3 and √12 = 2√3. The expression becomes 6√3 + 2√3 − 3√3 − 4√3, which combines to (6 + 2 − 3 − 4)√3 = √3. The correct choice is C, square root of 3.

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