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Tricky maths

Can anyone help with this?

Show that the sum between 1 and k of k.3^(3-1) =1/4[(3^k).(2k-1)+1].
20:01 Mon 30th Apr 2012
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dr b
can you clarify? what is k.3^(3-1) supposed to represent? 3^(3-1) is just 9.
20:08 Mon 30th Apr 2012
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Prudie
Agreed or it could be 3k^2 (3k squared)
20:12 Mon 30th Apr 2012
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boxtops
correction from OP here http://www.theanswerb.../Question1129862.html
20:17 Mon 30th Apr 2012

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Tricky maths 2

Sorry, there wsa an error. Show that the sum for 1 to k of k.3^(k-1)=1/4[(3^k).(2k-1)+1]...
20:16 Mon 30th Apr 20122 answers, last by dr b 20:35 Mon 30th Apr 2012
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