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Unformatted text preview: 22 0.9 23 0.9 24 0.9 ...) × × + × + × + × + Let’s denote 1 2 3 21 0.9 22 0.9 23 0.9 24 0.9 ... S = × + × + × + × + Multiple both sides by 0.9 1 2 3 4 0.9 21 0.9 22 0.9 23 0.9 24 0.9 ... S = × + × + × + × + Subtraction the second equation from the first, we get 1 2 3 4 0.1 21 0.9 0.9 0.9 0.9 0.9 ... S = × + + + + + 0.9 21 0.9 30 1 0.9 = × + =Hence (  ) 0.1 30 E N B S = × = (Tips on sum of series: you might practice on computing b n n a S nr = = ∑ , where a, b, r are constants. Think about different situations when r>1, r=1, r<1; what about b is finite or positive infinity? ) See the next page for solutions to problem 2.16, 2.17...
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 Fall '07
 BARD
 Addition, Px, EE351K homework assignment

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