Question 1117673
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if th 10th of an AP is double the 2nd find the 8th term given that a=7
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If thE 10th TERM of an AP is double the 2nd, find the 8th term given that a=7.
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General term,  {{{7+d(n-1)}}}, for difference d and index n


{{{7+d*(10-1)=2(7+d*(2-1))}}}

{{{7+9d=2(7+d)}}}

{{{7+9d=14+2d}}}

{{{9d-2d=14-7}}}

{{{7d=7}}}


{{{highlight(d=1)}}}-------common difference to get each successive term


Revising the general term,  {{{highlight(7+(n-1))}}}.


FIND THE 8TH TERM
let n equal to 8.
{{{7+(8-1)}}}
{{{7+7}}}
{{{highlight_green(14)}}}