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The Greek capital letter, ? , is used to represent the sum. The series 4+8+12+16+20+24 can be expressed as 6?n=14n . The expression is read as the sum of 4n as n goes from 1 to 6 .

Unpacking the meaning of summation notation This is the sigma symbol: ?. It tells us that we are summing something.

The symbol ? indicates summation and is used as a shorthand notation for the sum of terms that follow a pattern. For example, the sum of the first 4 squared integers, 12+22+32+42, follows a simple pattern: each term is of the form i2, and we add up values from i=1 to i=4.

We know that the sum of two numbers is the result obtained by adding two numbers. Thus, if {x1,x2,?,xn} { x 1 , x 2 , ? , x n } is a sequence, then the sum of its terms is denoted using the symbol ? (sigma). i.e., the sum of the above sequence = ?ni=1xi=x1+x2+?.xn ? i = 1 n x i = x 1 + x 2 + ? . x n .

This is the sigma symbol: ?. It tells us that we are summing something.

A series can be represented in a compact form, called summation or sigma notation. The Greek capital letter, ? , is used to represent the sum.

For example, suppose an accounts officer has 4 subordinates and 4 tasks. The subordinates differ in efficiency and take different time to perform each task. If one task is to be assigned to one person in such a way that the total person hours are minimised, the problem is called an assignment problem.

Sigma symbol is math is a Greek alphabet called "?" and is read as "sigma". It looks like capital E in the English alphabet. The Sigma symbol is also known as the summation symbol. It is used to write the sum of elements of a sequence.