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Find the wrong number in the series: 15,16,34,108,424,212515, 16, 34, 108, 424, 2125

  1. 108108

  2. 1616

  3. 424424

  4. 21252125

Show answer & explanation

Correct answer

108108

Explanation

The pattern is ×1+1,×2+2,×3+3,×4+4,×5+5\times1+1, \times2+2, \times3+3, \times4+4, \times5+5. So 34×3+3=10534 \times 3 + 3 = 105, not 108108.

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