Choose the odd number: Three of the numbers are exact multiples of 17; one is not. Identify the number that is not divisible by 17.

Introduction / Context:
This classification focuses on a specific divisor (17). The outlier is the one not divisible by 17.

Given Data / Assumptions:

• Candidates: 68, 88, 102, 238.
• Recall: 17 * 4 = 68; 17 * 6 = 102; 17 * 14 = 238.

Concept / Approach:
Check division by 17 using simple multiples or quick arithmetic.

Step-by-Step Solution:

Verification / Alternative check:
Multiply back: 17 * 5 = 85 and 17 * 6 = 102; 88 is between these and hence not a multiple.

Why Other Options Are Wrong:
They are exact multiples of 17 and follow the majority rule.

Common Pitfalls:
Relying on rough estimation without confirming adjacent multiples (85 and 102).

Final Answer:
88 is not divisible by 17 and is the odd number.