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oops. I made a typo LOL. The first line " therefore .." is meant to be at the end xD

yes - but you do not help by putting the numbers in
]

putting the numbers in ?

\[area _{n} = \frac{ 1 }{ n }( \frac{ r ^{3} }{ n ^{3} } -\frac{ r }{ n })\]

hmm.............

ahh okay.
So what i did was unnecessary?

^^ typo in formula
should be + not -

just distribute the expression I wrote above...

another typo in formula
it should be area r not area n

oh typo *\[A_r = \frac{ 1 }{ n } (\frac{ r^3 }{ n^3 }+\frac{ r }{ n })\]

The first summation is given by Part 1
the second is well known

okay.

okayyy