Discussion
Each of the terms below stands in a fixed relation to its neighbours. Find the rule and name the term that completes the run.
11, 22, 44, 88, 176, ?
Answer: D
Correct answer: 352
The terms are multiplied rather than added to. Dividing each by its predecessor gives the same result throughout: 22 over 11 is 2, and 44 over 22 is 2, so the ratio is 2. Multiplying the last term, 176 times 2 is 352. As a check, dividing the answer by 2 returns 176, which is the last term shown. Where the terms are small, listing a few extra terms of a candidate rule is quicker than reasoning about it.
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