i need help with two questions...
1. find the suma of all the intergers between 1 and 200 that are not multiples of 7.
and i have just realised that i have no idea how to do sigma questions on herebut i'll try to describe it.
2. find (at the bottom of the sigma sign r=1 and at the top of it n then next to it 1-(r/3)), giving your answer in the form (n/a)(b-n), where a and b and intergers.
thanks for any help
if you cant understand 2. ask me and i'll help you