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Ex 102, 18 In triangle ABC (Fig 1018),which of the following is not true (A) (𝐴𝐵) ⃗ (𝐵𝐶) ⃗ (𝐶𝐴) ⃗= 0 ⃗ (B) (𝐴𝐵) ⃗ (𝐵𝐶 Consider, a...
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