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Unformatted text preview: divisible is 2 by divisible is that square Any 4 by divisible be must Thus 2 a 4 by divisible be must 2 2 b ∴ 2 by divisible be must means which 2 b factor common a have must and 2 by divisible both are and So 2 2 b a However, a and b have no common factors rational not is 2 so irrational is 2 ∴ Exercise 2B; 2a, 3, 4 (root 3), 8, 14*...
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 Spring '11
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 Rational number, Irrational number

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