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BBC 11plus quiz

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Narbadingi | 13:43 Mon 30th Jun 2008 | Quizzes & Puzzles
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I had a go at the BBC's 11plus questions today, but couldn't work out the answer to this one even when they gave the answer. Can someone explain it to me please? Ta.

Which number does not fit in the sequence?
1, 9, 16, 23, 27, 31, 34

The answer's 23, apparently. I have no idea why.
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1+8 = 9
9+7 = 16
16+6 = 22 (not 23)
22+5=27
27+4=31
31+3=34
Question Author
Thank you Cheekychick. I feel such a twerp now - I didn't think about replacing a number. Obvious now.

Ta muchly

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