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Mathematics for IGCSE & O level - Surds (Section 3 - No. 2)

Which calculation below will result in a rational answer?
√2 * √5
√3 + √3
2/√2
(3-√2) * (3+√2)

Explanation

2/√2 = √2. (3-√2) * (3+√2) = 9 -2 = 7, rational

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