notoriousb
notoriousb
28-03-2017
Mathematics
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Summation problem - see screeshot
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LammettHash
LammettHash
28-03-2017
[tex]\displaystyle\sum_{i=2}^4\sum_{j=i}^4j^3=\left\{\sum_{j=2}^4+\sum_{j=3}^4+\sum_{j=4}^4j^4\right\}j^3[/tex]
[tex]=3\times4^3+2\times3^3+2^3[/tex]
[tex]=254[/tex]
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