Question 914813
{{{u[1]=-1}}}
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{{{u[k]=6k-7}}}
{{{u[14]=6(14)-7=84-7=77}}}
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{{{S[k]=(k/2)(u[1]+u[k])}}}
{{{S[k]=(14/2)(-1+77)}}}
{{{S[k]=7(76)}}}
{{{S[k]=532}}}