What will come in place of ‘?’ in the following number series? 7, 12, 15, 16, 15, 12, 7, ? , -9

What will come in place of ‘?’ in the following number series?

7, 12, 15, 16, 15, 12, 7, ? , -9

1). -3
2). 5
3). 7
4). 12

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