Number Puzzle

Find the next number in the series shown below!

12, 13, 11, 14, 10, 15, ?

Use addition and subtraction operations to understand this pattern!

Hint-

12, 13, 11, 14, 10, 15, ?

SOLUTION!
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Solution:

The given series has the sequence +1, -2, +3, -4, +5.
According to this pattern, we will have to subtract 6 from the previous number.
Thus, the unknown number is 15-6=9.
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