Insert the missing number
121, 112, ..., 97, 91, 86	Choose one.
A) 102  B) 108  C) 99  D) 104  E) 106
first and second number difference is starting from 9, and further decresed by 1 by each iteration.   121, 112, ..., 97, 91, 86....   Difference between two numbers Will be as 9, 8, 7, 6, 5,...   ANSWER:104
<result>D</result>
Insert the missing number
121, 112, ..., 97, 91, 86