SUMMATION FORMULA

When large number of data are concerned, then summation is needed quite often. To write a very large number, summation notation is useful.  The sequence [1,2,4,2..] whose value is the sum of the each number in the sequence is summation. In simple words, summation notation helps write a short form for addition of very large number of data. We use this symbol –

We use this symbol –  , called sigma to denote summation. When a sequence is needed to add from left to right, it could run intermediate result in a partial sum, running total or prefix sum.

The form in which the summation notation is used:

To make it clear, read what each notation in the summation formula stands for:

Solution:

Video Lesson

Formulas for Summation