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Simplify 1/(sqrt7 + sqrt6).

Asqrt7 + sqrt6
Bsqrt7 - sqrt6 + 1
Csqrt7 - sqrt6
Dsqrt6 - sqrt7
Answer & Solution
Correct answer: C. sqrt7 - sqrt6
Multiplying top and bottom by sqrt7 - sqrt6 gives (sqrt7 - sqrt6)/(7-6).
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