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What is a Goal Seek
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Goal Seek is a formula which is used for Reverse Calculation

It can only be used if some formula or links have been used while passing entries

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How to do?
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Data-->What-if Analysis--->Goal Seek

For Excel 2003: Tools --> Goal Seek

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It asks for 3 things
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Set Cell
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—Select Cell which has old value (This should have formulas)

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To Value
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—Put New Value(This should have new value)

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By Changing
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-Select Cell where Answer Required (This should not have a formula)

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Example 1
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Download file and try

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Example 2
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Example 3
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Example 4
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Example 5
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