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sarah12345
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#1
the rth term in an arithmatic progression is 1+4r find in terms of n the sum of the first n terms of the sequence


thanks
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J.F.N
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(n/2)(10+(n-1)4)=3n+2n^2
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sarah12345
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(Original post by J.F.N)
(n/2)(10+(n-1)4)=3n+2n^2

thanks thats what i thought the books wrong i think

cheers!
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