Multiple choice general knowledge math & puzzles

1, 4, 9, 18, 35, ?

  1. 69

  2. 70

  3. 68

  4. 67
Reveal answer Fill a bubble to check yourself
C Correct answer
Explanation

The pattern is (x * 2) + 2, then (x * 2) + 1, then (x * 2) + 0... 1*2+2=4; 4*2+1=9; 9*2+0=18; 18*2-1=35; 35*2-2=68. The sequence follows a decreasing increment added to the double of the previous number.

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