Question
Mathematics Question on Sequence and series
If nth term of a series is n+(-1)n-1, n = 1,2,3,..., then the sum of first 40 terms of the series is
A
810
B
820
C
821
D
819
E
780
Answer
820
Explanation
Solution
The correct option is (B) : 820
If nth term of a series is n+(-1)n-1, n = 1,2,3,..., then the sum of first 40 terms of the series is
810
820
821
819
780
820
The correct option is (B) : 820