11.
In the following number series a wrong number is given. Find out the wrong number.
150, 450, 750, 1060,1350,1650,1950

12.
What will come at the place of question mark ?
5690, 5121, 4552, 3983, 3414, 2845, ?

13.
What will come at the place of question mark ?
6, 13, 28, 59, ?, 249.

14.
What will come at the place of question mark ?
4, 8, 10, 14, 16, 20, ?

15.
What will come at the place of question mark ?
9, 17, 33, 65, ?

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