`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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