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      Question

      What is the unit digit of the number 'B' 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 9 Correct Answer Incorrect Answer

      Solution

      ATQ;

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

      So, 'B' = 210 - 61 = 149

      Unit digit of 'B' = 9

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