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sequences and series watch

1. the rth term of an arithmetic series is (2r-5)
(a)write down the first three terms
(b)state the value of the common difference
(c)show that Σ⌃n under sigma r=1 (2r-5)=n(n-4)
2. (Original post by marocboy_sofly)
the rth term of an arithmetic series is (2r-5)
(a)write down the first three terms
(b)state the value of the common difference
(c)show that Σ⌃n under sigma r=1 (2r-5)=n(n-4)

What have you tried?

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Updated: March 6, 2016
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