Multiple choice

Find the wrong number in the following number series. 87, 116, 174, 261, 387, 522

  1. 387

  2. 174

  3. 261

  4. 87

  5. 522
Reveal answer Fill a bubble to check yourself
A Correct answer
Explanation

The pattern is: add 29, then 58, then 87, then 130.5, then 195.75. Each difference is multiplied by 1.5 to get the next difference (29×1.5=43.5≈44, 44×1.5=66, 66×1.5=99, 99×1.5=148.5). Wait, let me verify: 116-87=29, 174-116=58, 261-174=87, 387-261=126, 522-387=135. The differences should follow ×1.5 pattern: 29, 43.5, 65.25, 97.875... Given 87 doesn't fit perfectly. Alternatively: 87+29=116, 116+58=174, 174+87=261, 261+130.5=391.5 (not 387). So 387 is wrong.

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