1.

Select the number that can replace the question mark (?) in the following series._x005F_x000D_  _x005F_x000D_ 1, 5, 9, ?, 21_x005F_x000D_

A. 20
B. 11_x005F_x000D_
C. 19_x005F_x000D_
D. 15
Answer» E.


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