Answers

2015-02-21T09:55:00+05:30
Sum=[n*(n+1)]/2
where, 'n' is the maximum value of the series.
here it is 100
hope this helps..  :)
2 4 2
pls mark it as the best...please..
2015-02-21T10:05:59+05:30
 \frac{n(n+1)}{2} is the formula..these are common numbers...n=number of terms
1 5 1