Question

(help please! I have a test tomorrow!)How would you evaluate this series: 1 x 2 + 2 x 3 +3 x 4 +...+ 100 +101

Answer 1

\[\sum_{1}^{100}n(n+1) = 343,400\]

Answer 2

how did you get that?

Answer 3

using a calculator
but I guess you could list the 100 products and add them
there may be a shortcut, but I don't see it

Answer 4

but what did you put into the calculator?

Answer 5

there are several different types and each is different
read the instructions for yours
look for Series or Summation
but basically, you load the function in memory n(n+1)
then give it the range 1..100 and let it grind

Answer 6

okayy i see