Find the next number in the series: 3, 7, 15, 31, 63, ?
Answer and explanation
Correct answer: B. 127
- Step 1: Notice pattern: , , , . Alternatively: differences are 4, 8, 16, 32. Step 2. Next difference is 64. Step 3. . Answer: 127. Why not the others: 125 adds 62; 129 adds 66; 121 adds 58.
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