Discussion
One term of this sequence has been replaced by a question mark. Find the rule and name the term that completes the run.
5, 20, 80, 320, ?
Answer: B
Correct answer: 1280
The terms are multiplied rather than added to. Dividing each by its predecessor gives the same result throughout: 20 over 5 is 4, and 80 over 20 is 4, so the ratio is 4. Multiplying the last term, 320 times 4 is 1280. As a check, dividing the answer by 4 returns 320, which is the last term shown. The first difference to compute is between the last two terms, since it constrains the answer most directly.
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