Number Series — Find the Wrong Term (Add 1110 Each Step) Which number is incorrect in: 1236, 2346, 3456, 4566, 5686?

Introduction / Context:
Some sequences add a fixed constant each step. Spotting a neat addition such as +1110 quickly reveals the outlier that fails to follow the rule.

Given Data / Assumptions:

• Numbers: 1236, 2346, 3456, 4566, 5686
• Assume a single wrong term.
• Test for constant addition.

Concept / Approach:
Check whether each term equals the previous plus 1110. This pattern aligns with the visible digit structures and is easy to validate by subtraction.

Step-by-Step Solution:
2346 − 1236 = 1110 ✔3456 − 2346 = 1110 ✔4566 − 3456 = 1110 ✔5686 − 4566 = 1120 ✖ (should be 1110)Hence, the last value should be 4566 + 1110 = 5676, not 5686.

Verification / Alternative check:
Replacing 5686 with 5676 yields a perfect constant increment sequence. Therefore 5686 is the incorrect term.

Why Other Options Are Wrong:

• 1236, 3456, 4566: Each maintains the +1110 progression; they are consistent and correct.

Common Pitfalls:
Overcomplicating with multiplicative rules. Always try simple constant addition or subtraction first when digits suggest a steady shift.

Final Answer:
5686