What should come in place of the question mark (?) in the following number series?
11 21 33 47 63 ? Choose the correct option:
A) 80
B) 81
C) 82
D) 83
E) 84
The numbers increase by 10, 12, 14, 16,...   The next number should be   63+18= 
<gadget id="calculator">  63+18</gadget>
<output>81</output>
81   The answer is 81.
<result>B</result>
What should come in place of the question mark (?) in the following number series?
11 21 33 47 63 ?