Grade 9 · Math
Continue a geometric sequence
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A sequence multiplies by the same positive factor each time: 5, 10, 20, 40, ___. What is the next term?
- 79
- 80
- 82
- 81
See the answer & why
80
Each term is multiplied by 2. The next term is 40 × 2 = 80.
A little hint: Find the constant ratio by dividing a term by the previous term.
Divide successive nonzero terms to check for a constant ratio.
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