Which is the incorrect value in the series 2, 4, 7, 14, 17, 34, 37, 64?

Correct answer: 64. The pattern alternates ×2 and +3: 2, 4, 7, 14, 17, 34, 37, 74. The last term should be 74, so 64 is incorrect.

Background: Look for alternate operations when the pattern is not simple.

• 17: 17 = 14 + 3 is correct.
• 34: 34 = 17 × 2 is correct.
• None of these: “None of these” is incorrect because 64 is wrong.

Did you know? 37 × 2 = 74.

Memory trick: ×2, +3, ×2, +3 …