Answer:
Option B
Explanation:
1st,3rd,5th,7th,9th terms are 0,2,6,12,20....
( difference between the numbers are in even number of increasing order 2,4,6,8,10..)-------(1)
2nd,4th,6th,8th terms are 7,17,31,49 ...
(difference in increasing order of 10,14,18....)-------(2)
Last term of the series belongs to (1) .So, next term will be from (2).
Adding 22 to 49 to get 71.
