WBCS.LIVE practice question

If a clock strikes 12, how many times does the hammer hit between 1 o'clock and 12 o'clock (inclusive)?

Solve this multiple-choice question and check the correct answer with its explanation below.

Answer options

  1. 12
  2. 72
  3. 78
  4. 144

Correct answer and explanation

Correct answer: 78

Explanation: ✅ Correct Answer: (C) 78 📚 Explanation: Step-1: The clock strikes once at 1, twice at 2, thrice at 3, and so on, up to twelve times at 12. Step-2: To find the total number of strikes, add the numbers from 1 to 12: (1 + 2 + 3 + 4 + 5 + 6 + 7 + 8 + 9 + 10 + 11 + 12). Step-3: Use the formula for the sum of first 'n' natural numbers: [n(n+1)] ÷ 2. Here n=12, so (12 x 13) ÷ 2 = 6 x 13 = 78.