Work Step by Step
Here, we have the first term: $i_1=2(1)^3 =2$; Second Term: $i_2=2(2)^3=16$ Third Term: $i_3=2(3)^3=54$ Last Term: $i_4=2(4)^3=128$ Add all the terms: $S_i=2+16+54+128=200$
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