Need help regarding summation in calculator

hi guys..

can any1 here solve my query by using the summation with scientific calculator? would appreciate it, thanks..

calculator model?? TI-??, casio?? specify pls.

Reading the manual that comes with the calculator helps.

thanks for replies..

i have searched it on a search engine and found what i wan..

anyway..this calculator was like 6-7 years ago.. manuel lost long ago also

there's a way

I used to play with my scientific calculator for summations in the era where graphic calculators were unheard of