Question

Write the sum (in sigma notation)

1 + 3/2 + 2 + 5/2 + 3 + 7/2 + 4

Sigma notation?

Answer 1

= 2/2 + 3/2 + 4/2 + ... 8/2
= ∑ (1+n)/2 for n = 1 to 7

This answer is not unique, there are many ways to express it

Answer 2

Consider the following sum

1/4*5+1/5*6+1/6*7+ ...+1/18*19

If it were written in sigma notation as
a=
b=
f(i)=