Given that Sj(n)=1j+2j+3j+...+nj,j∈Z+Sj(n)=1j+2j+3j+...+nj,j∈Z+ Using telescopic series technique or otherwise, which of

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Given
that Sj(n)=1j+2j+3j+...+nj,j∈Z+Sj(n)=1j+2j+3j+...+nj,j∈Z+ Using
telescopic series technique or otherwise, which of the following
statements is correct
about S1(n)S1(n) and S2(n)S2(n)
Select one:
A. S2(n)=0.5n(n+1)S2(n)=0.5n(n+1) and S1(n)=n6(n+1)(2n−1)S1(n)=n6(n+1)(2n−1)
B. S1(n)=0.5n(n+1)S1(n)=0.5n(n+1) and S2(n)=n6(n+1)(2n+1)S2(n)=n6(n+1)(2n+1)
C. S2(n)=0.5n(n−1)S2(n)=0.5n(n−1) and S1(n)=n6(n+1)(2n+1)S1(n)=n6(n+1)(2n+1)
D. S1(n)=0.5n(n+1)S1(n)=0.5n(n+1) and S2(n)=n6(n−1)(2n+1)