Multiple choice

Find out the wrong number in the following series. 254 257 263 290 354

  1. 263

  2. 290

  3. 257

  4. 254

  5. 354
Reveal answer Fill a bubble to check yourself
C Correct answer
Explanation

Pattern based on cubes: 3^3 + 3 = 30, but we have 254. Let me check differences: 257-254=3, 263-257=6, 290-263=27, 354-290=64. Differences are 3, 6, 27, 64. These are 3^1, (3)^2, 3^3, 4^3. The pattern breaks - 257 doesn't fit the cube pattern. The correct term should be different.

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