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    (Original post by Notnek)
    For c) you need to consider the expression inside the sigma so for r = 1:

    a_{1+1} + ka_1 = a_2 + ka_1 = 5-4k + k(4) = 5

    Try doing it for r = 2 and r = 3.
    Haha no way they all equal 5 lol.
    Does this mean the answer is 500?
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    (Original post by Notnek)
    For c) you need to consider the expression inside the sigma so for r = 1:

    a_{1+1} + ka_1 = a_2 + ka_1 = 5-4k + k(4) = 5

    Try doing it for r = 2 and r = 3.
    No way they all equal 5 lol.
    Does this mean the answers 500?
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    Sorry i'm new to the student room and sent it twice as i didn't realise it already sent.
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    (Original post by HiggsBoson)
    Haha no way they all equal 5 lol.
    Does this mean the answer is 500?
    That’s correct
 
 
 
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