Question

Identify the missing number in the series:
15 9 5
23 8 13
31 9 ?

• A. 13
• B. 15
• C. 19
• D. 23
• E. 25

Hint:

In such number series questions, always check the differences between consecutive numbers and identify a consistent pattern in the series.

Answer 1

The Correct Option is C

Step 1: Identify the pattern.
Look at the differences between the numbers in each row:
- First row: \( 15 - 9 = 6 \) and \( 9 - 5 = 4 \).
- Second row: \( 23 - 8 = 15 \) and \( 8 - 13 = -5 \).
- Third row: \( 31 - 9 = 22 \), so the missing number should follow the pattern. The difference between 9 and the missing number is -4, so the missing number is \( 9 + (-4) = 19 \).
Step 2: Conclusion.
The correct answer is (C) 19, as it follows the observed pattern in the series.