Discussion
A rule that fits every term shown will also give the missing one. Find the rule and name the term that completes the run.
9, 27, 81, 243, ?
Answer: D
Correct answer: 729
The terms are multiplied rather than added to. Dividing each by its predecessor gives the same result throughout: 27 over 9 is 3, and 81 over 27 is 3, so the ratio is 3. Multiplying the last term, 243 times 3 is 729. As a check, dividing the answer by 3 returns 243, which is the last term shown. If two different rules both fit, the simpler is intended; series questions do not reward ingenuity beyond the obvious.
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