Discussion
The run of numbers below stops one term short of where it should. Find the rule and name the term that completes the run.
2, 18, 162, 1458, ?
Answer: A
Correct answer: 13122
The terms are multiplied rather than added to. Dividing each by its predecessor gives the same result throughout: 18 over 2 is 9, and 162 over 18 is 9, so the ratio is 9. Multiplying the last term, 1458 times 9 is 13122. As a check, dividing the answer by 9 returns 1458, which is the last term shown. The answer to a series question should always be substituted back before it is chosen.
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