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Q: 3, 7, 6, 5, 9, 3, 12, 1, 15, ?

  • 1
    18
  • 2
    13
  • 3
    -1
  • 4
    3
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Answer : 3. "-1"
Explanation :

There are two series, beginning respectively with 3 and 7. In one 3 is added and in another 2 is subtracted. 
The next number is 1 – 2 = -1.

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