What will come in place of the x in the following Number series? 3, 6, 12, x , 33	Pick one
A) 33  B) 37  C) 39  D) 21  E) 43
(D)   The pattern is + 3, + 6, + 9, +12 â€¦â€¦â€¦..   So the missing term is = 12 + 9= 
<gadget id="calculator">12 + 9</gadget>
<output>21</output>
21
<result>D</result>
What will come in place of the x in the following Number series? 3, 6, 12, x , 33