Posted by Ama on Thursday, November 22, 2012 at 12:22am.
an = ( - 1 ) ^ n + 7
For odd numbers 1 , 3 , 5 ...
( - 1 ) ^ n = - 1
and
( - 1 ) ^ n + 7 = - 1 + 7 = 6
For even numbers 2 , 4 , 6 ...
( - 1 ) ^ n = 1
and
( - 1 ) ^ n + 7 = 1 + 7 = 8
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