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junior college 1 | H2 Maths
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Charlotte
Charlotte

junior college 1 chevron_right H2 Maths chevron_right Singapore

Help pls

Date Posted: 1 year ago
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Low Yi Yin
Low Yi Yin's answer
251 answers (Tutor Details)
1st
Hope this helps! ;))
First I went to find summation of
(r+1)^3 -r^3 by MOD.
Then, I equate to summation of 3r^2 + 3r +1.
Manipulate, simplify and get values for summation of r and 1, which is n/2 (first + last) and n respectively, to find summation of r^2.