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44. Number series

Find the next number in the series: 15,12,13,10,11,8,?

Subtraction followed by addition.

Another solution involves alternating sequences.

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What is ziuq spelt backwards?

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kyrossays...

Two separate (alternating) sequences.

The missing number belongs to the first sequence (subtracting 2 for each term.)

15,13,11,9

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Ice-Tsays...

9. First in the series deduct 3, then add one.

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