haleysimpson99 haleysimpson99

15-05-2016
Mathematics

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Which equation can be used to find the nth term for the sequence 2, 5, 10, 17

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chengjing chengjing

15-05-2016

1，2，5，10，17，26，37，50，65，82，101，122，145，170，···
an＝n^2-2n+2.
Sn＝n(2n^2-3n+7)/6

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