sequencessummations内容摘要:
+…+n) = c + 2c +…+ nc r arjj 0n arj 1j 0n arkk 1n 1 arn 1 arkk 1n arn 1 a arkk 0nTelescoping Sums ( a jj 1n a j 1 ) ( a 1 a 0 ) ( a 2 a 1 ) ( a 3 a 2 ) ... ( a n a n 1 ) a n a 0[ k2k 14 ( k 1 )2] ( 12 02) ( 22 12) ( 32 22) ( 42 32)42 16 0 16Example Closed Form Solutions k n ( n 1 )2k 1nA simple formula that can be used to calculate a sum without doing all the additions. Example: Proof: First we note that k2 (k1)2 = k2 (k22k+1) = 2k1. Since k2(k1)2 = 2k1, then we can sum each side from k=1 to k=n [ k 2k 1n k 1。sequencessummations
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