1. What do the two numbers at the top and bottom of the sigma sign mean?
These are the values the variable takes on. The variables after the sigma sign take on all INTEGER values from the lowest one at bottom of the sigma sign to the highest one at the top of the sigma sign
e.g.
. means put n = 1, then n = 2, then n = 3, then n = 4 and finally n = 5 into the expression 3 n. i.e. Each integer between 1 and 5.
2. What is the difference between a sequence and a series?
A sequence is an ordered set of numbers which is determined by a rule.
A series is a sum of successive members of a sequence.
