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The formula for the sum of an infinite series is

          a
S = ------          where a is the first term and r is the common ratio.  Note     
        1-r           that the magnitude of the common ratio, r, must be <1.

The sum to the infinite geometric series is calculated using:

[tex]\mathbf{S_{\infty} = \frac{a}{1-r}}[/tex]

Where a represents the first term, and r represents the common ratio

Assume the first term of the series is 2, and the common ratio is 1/2.

The sum to infinite becomes

[tex]\mathbf{S_{\infty} = \frac{2}{1-1/2}}[/tex]

Simplify the denominator

[tex]\mathbf{S_{\infty} = \frac{2}{1/2}}[/tex]

Divide the fractions

[tex]\mathbf{S_{\infty} = 4}[/tex]

Hence, the sum to infinity is 4

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