Rinse and repeat, until the variable reaches the number on top of the sigma. Then you add 1 to that value and plug it in again. Then you plug in that value to the expression on the right. See how that works? We took every value of k between 2 and 5 inclusive, and substituted each into the expression then we added everything up.Īs a bonus, once you understand sigma notation, you understand Big Pi notation for free: a Big Pi ( ) works exactly the same as a Big Sigma, except it denotes multiplication instead of addition (‘P’ is for ‘product’). The stuff under the sigma tells you to set some variable (usually ‘i’ or ‘k’ for some reason) to a starting value. If you’re still confused, don’t worry an example should make things clear! For each value of k between a and b, f(k) will be some value which gives one term in the sum.
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