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Still pretty confused on this.
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Still pretty confused on this.

Still pretty confused on this.-example-1
User Eironeia
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\displaystyle \sum_(i=3)^7(3i-1)=3\cdot3-1+3\cdot4-1+3\cdot5-1+\\\\ +3\cdot6-1+3\cdot7-1=8+11+14+17+20=70
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