Summation problem - see screeshot

asked Feb 3, 2018 23.0k views

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$\displaystyle\sum_(i=2)^4\sum_(j=i)^4j^3=\left\{\sum_(j=2)^4+\sum_(j=3)^4+\sum_(j=4)^4j^4\right\}j^3$

=3*4^3+2*3^3+2^3

Eaydin answered Feb 8, 2018

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