Sunday, 4 December 2011

Brain Teaser


What is the missing number in the following series?
20, 5, 15, 22, 6, 16, 24, _________17, 26, 8, 18







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Answer
Consider 3 terms of the series at a time:
20 – 5 = 15      (20, 5, 15)
22 – 6 = 16      (22, 6, 16)
24 – 7 = 17      (24, 7, 17)
26 – 8 = 18      (26, 8, 18)

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