5,6,8,11,?,20,26,33  Choose the correct option
A) 10
B) 13
C) 15
D) 8
E) 19
The Pattern is + 1, + 2, +3, ...   11+4= 
<gadget id="calculator">11+4</gadget>
<output>15</output>
15   Answer :15
<result>C</result>
5,6,8,11,?,20,26,33