SOLUTION: Please help me solve this: A certain arithmetic sequence has {{{a[51]=23}}}
and {{{a[101]=-127}}}. Find {{{a[1]}}}, {{{d}}}, {{{a[n]}}}, and {{{a[78]}}}
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Sequences-and-series
-> SOLUTION: Please help me solve this: A certain arithmetic sequence has {{{a[51]=23}}}
and {{{a[101]=-127}}}. Find {{{a[1]}}}, {{{d}}}, {{{a[n]}}}, and {{{a[78]}}}
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Use
Substitute ,
Substitute ,
So we have this system of equations:
Solve that system of equation by substitution or addition.
If you don't know how post again asking how. The
solution is , ""=""}}}
Therefore substituting those in
Substitute n=78
Edwin
