Question

can you have a negative value for a summation problem?

Answer 1

yes, why not

Answer 2

of course summation is addition

lets take an example

say we have to add -1 and -2

the summation is -3.. that is just an example i took but it proves that we can have a negative answer for sure

Answer 3

\[\sum_{i=1}^{5} (-i)=-1-2-3-4-5=-15\]

Answer 4

That is a better example :D