Select the number that can replace the question mark (?) in the following series. 176, 167, 156, 147, 136, ?

Question

Select the number that can replace the question mark (?) in the following series.

176, 167, 156, 147, 136, ?

1. A. 126
2. B. 119
3. C. 127 (Correct answer)
4. D. 124

Correct Answer

Option C — 127

Detailed Solution & Explanation

The correct answer is 127.

Key Points

• The differences alternate −9 and −11: 176(−9)167(−11)156(−9)147(−11)136.
• The next step is −9, so 136 − 9 = 127.

Additional Information

• Alternating differences are the most common SSC number-series design after constant differences.
• Write the gaps under the series: −9, −11, −9, −11 makes the next step unmistakable.
• If first differences show no pattern, take second differences; a constant there means the series is quadratic.