Question

Write the sum using summation notation -1+2+5+8+...+44

Answer 1

`\sum_(i=0)^(15) (3i-1)`

Explanation:

for i=0 you have the first term, 3*0-1 = -1

for i=1 you have the second term, 3*1-1 = 2

...

for i=15 you have the last term, 3*15-1 = 44