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      Question

      What is the highest common factor of 120 and

      1800?
      A 134 Correct Answer Incorrect Answer
      B 120 Correct Answer Incorrect Answer
      C 142 Correct Answer Incorrect Answer
      D None of these Correct Answer Incorrect Answer

      Solution

      ATQ,

      Prime factors of 120 = 2 Γ— 2 Γ— 2 Γ— 3 Γ— 5

      Prime factors of 1800 = 2 Γ— 2 Γ— 2 Γ— 3 Γ— 3 Γ— 5 Γ— 5

      HCF = 2 Γ— 2 Γ— 2 Γ— 3 Γ— 5 = 120

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