Answers

2014-11-30T12:19:35+05:30
The formula is 

\frac{n(n+1)}{2}

where n is the number of terms

0
Number of term is not given
hope it helps
plz mark as best
2014-11-30T12:24:15+05:30
I think the answer is 1 because the question states"integer" which means only one
1st integer is 1 and n(n+1)
                     --------------------
                             2 
therefore 1+1/2 =1
i think bcuz there is no way else for it

1 5 1