Which is wrong in the number series below ? 7, 16, 34, 69, 142, 286

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Q. Which is wrong in the number series below ? 7, 16, 34, 69, 142, 286

Wrong Term: 69

Reason: Series follows ×2 + 2

• 7 → 7×2+2 = 16


• 16 → 16×2+2 = 34


• 34 → 34×2+2 = 70 ⟵ should be 70, not 69


• 70 → 70×2+2 = 142


• 142 → 142×2+2 = 286

Corrected series : 7, 16, 34, 70, 142, 286.