COMPLETE THE SERIES..
1, 3, 7, 11, 13,... ? Choose the correct answer
A) 16
B) 17
C) 18
D) 19
E) 20
i think in this series we need to divide series in two parts i.e in terms of even place term and odd place term.i.e   1,7,13 so in odd term you see a difference of 6.   and in even terms there is difference of 8   3,11 so next term will be  11+8= 
<gadget id="calculator"> 11+8</gadget>
<output>19</output>
19.   so series is like this   1,3,7,11,13,19.   ANSWER:19
<result>D</result>
COMPLETE THE SERIES..
1, 3, 7, 11, 13,... ?