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    Question

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

    subtracting the largest two-digit prime number from the least common multiple (LCM) of all single-digit prime numbers?
    A 4 Correct Answer Incorrect Answer
    B 5 Correct Answer Incorrect Answer
    C 1 Correct Answer Incorrect Answer
    D 2 Correct Answer Incorrect Answer
    E None of these Correct Answer Incorrect Answer

    Solution

    ATQ;

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

    So, 'Y' = 210 - 89 = 121

    Unit digit of 'Y' = 1

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