61-66 ■ Sigma Notation Write the sum without using sigma notation.
The sum of without sigma notation.
The summation is given as,
The sum of the first terms of any sequence can be written summation or sigma notation represented as .
The sigma notation is used as follows,
The left-hand side is read as sum of from to .
The letter is the index of summation and replaced by an integer .
The sum of from to is,
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