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Last edited by Punch; June 11th 2011 at 12:03 AM.
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Sum ranges from r =1, not n =1, right? It's equivalent to:
Originally Posted by TheCoffeeMachine Sum ranges from r =1, not n =1, right? It's equivalent to: sorry, mistake on my part
Last edited by TheCoffeeMachine; June 11th 2011 at 01:09 AM.
Hello, Punch! Write out the terms . . . . . . . We note that most of the terms cancel out . . . . . . . And we have: . . . . . . . . . . . . Therefore:.
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