Select the correct option that will fill in the blank and complete the series.
-1, 2,7, ?, 23, 34
Correct Answer is 14.
The difference between-1 and 2 is 1.
The difference between 2 and 7 is 5.
The difference between 7 and 14 is 7.
The difference between 14 and 23 is 9.
The difference between 23 and 34 is 11.
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