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    (Original post by Akhito Kanbara)
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    i would try proof by induction first...
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    what is induction. the trying method? sean fm i dunno how to to start because my teacher heaches only sum of r or r square. not like this one number to the power of r.
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    (Original post by Akhito Kanbara)
    what is induction. the trying method? sean fm i dunno how to to start because my teacher heaches only sum of r or r square. not like this one number to the power of r.
    Induction is a specific technique that's most useful when you're trying to prove a result for positive integers and you're actually given the result that you're trying to prove.

    Are you studying for UK A levels or some other course? If induction isn't covered in your textbook, google "principle of induction" or "mathematical induction" to get a start.
 
 
 
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