arithmetic series???????????????????
how do u solve sequences with alternating differences (i know it guess and check) but for example what would the sequence equation be for 11,9,6,4... if i can get the answer for this i will know how to do the rest
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OK, here's the answer: a{n} = [ 55 – 10n + (-1)^n ] ⁄ 4
I think you'd have to give the equation in two parts (piecewise):
a(n) = 13.5 - 2.5n if n is odd
a(n) = 14 - 2.5n if n is even
IMO anyway