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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 ├Ч 2 ├Ч 2 ├Ч 3 ├Ч 5

    Prime factors of 1800 = 2 ├Ч 2 ├Ч 2 ├Ч 3 ├Ч 3 ├Ч 5 ├Ч 5

    HCF = 2 ├Ч 2 ├Ч 2 ├Ч 3 ├Ч 5 = 120

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