What number comes next in the series 5, 15, 45, 135, 405, ...?
Answer and explanation
Correct answer: B. 1215
- Step 1: Each term is 3 times the previous one, so the next term is 405 x 3 = 1215. Answer: 1215. Why not the others: 408, 540 and 1220 don't fit.
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