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    • Question

      A number '71945b' is divisible by 6, but not by 5. What is

      the value of (b² + 1)?
      A 17 Correct Answer Incorrect Answer
      B 25 Correct Answer Incorrect Answer
      C 13 Correct Answer Incorrect Answer
      D 10 Correct Answer Incorrect Answer

      Solution

      ATQ,

      Sum = 7 + 1 + 9 + 4 + 5 + b = 26 + b

      We want (26 + b) divisible by 3 and b even (for divisibility by 2), and ≠ 0 or 5.

      Try b = 4 → 26 + 4 = 30

      So, b = 4

      (b² + 1) = 16 + 1 = 17

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