Saturday, April 29, 2017

`sum_(n=51)^100 (7n)` Find the partial sum.

`sum_51^100 7n`


The arithmetic sum formula is


`S_n=n/2(a_1+a_n)`


The number of terms in the sequence is n=50.


The first term in the sequence `a_1=7(51)=357.`


The last term in the sequence `a_n=7(100)=700`


`S_n=50/2(357+700)`


`S_n=25(1057)`


`S_n=26425`



`sum_51^100 7n`


The arithmetic sum formula is


`S_n=n/2(a_1+a_n)`


The number of terms in the sequence is n=50.


The first term in the sequence `a_1=7(51)=357.`


The last term in the sequence `a_n=7(100)=700`


`S_n=50/2(357+700)`


`S_n=25(1057)`


`S_n=26425`



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