Multiple choice general knowledge math & puzzles

Find the missing number: 15, 31, 63, 127, 255, ___?

  1. 509

  2. 512

  3. 510

  4. 511
Reveal answer Fill a bubble to check yourself
D Correct answer
Explanation

The pattern is (Previous Number * 2) + 1. 15*2+1=31, 31*2+1=63, 63*2+1=127, 127*2+1=255. Therefore, 255*2+1 = 511. This is a standard geometric growth pattern plus a constant.

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