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    4. HCF and LCM
    5. What is the unit digit of the number 'Z' obtained by subtracting the largest two-digit prime number

    Question

    What is the unit digit of the number 'Z' obtained by

    subtracting the largest two-digit prime number from the least common multiple (LCM) of all single-digit prime numbers?
    A 3 Correct Answer Incorrect Answer
    B 5 Correct Answer Incorrect Answer
    C 1 Correct Answer Incorrect Answer
    D 2 Correct Answer Incorrect Answer

    Solution

    ATQ;

    LCM of all single-digit prime numbers = (2 × 3 × 5 × 7) = 210

    So, 'Z' = 210 - 67 = 143

    Unit digit of 'Z' = 3

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