Difficulty: Easy
Correct Answer: 479
Explanation:
Introduction / Context:
Series can grow rapidly due to multiplicative rules combined with small additive increments. Identifying the correct multiplier and incremental add-on is key for quick solutions in exams.
Given Data / Assumptions:
Concept / Approach:
Check transitions term by term to see if there is a systematic increase in multiplier and a small, related add-on. A common construction is multiplying by consecutive integers and then adding a steadily increasing small number.
Step-by-Step Solution:
3 → 7: 3 * 2 + 1 = 77 → 23: 7 * 3 + 2 = 2323 → 95: 23 * 4 + 3 = 95Pattern: multiply by 2, 3, 4, and add 1, 2, 3 respectively.Next step should be: multiply by 5 and add 4.95 * 5 + 4 = 475 + 4 = 479
Verification / Alternative check:
The sequence rule is consistent across all transitions: multiplier increases by 1 and the added constant also increases by 1. Thus, 479 follows logically.
Why Other Options Are Wrong:
Common Pitfalls:
Assuming a constant multiplier or skipping the additive pattern. Always test a few transitions to reveal both parts of the rule.
Final Answer:
479
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