Question 860718
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Hi,
{{{a[3] = a[1] + 2d = 14}}}
{{{a[8] = a[1] + 7d  = -3.5}}}
           -5d = 17.5    |subtracting a8 from a3
            d = -3.5   and {{{a[1] = 21
{{{a[n] = 21 + (n-1)(-3.5)}}}
{{{a[n] = -3.5n + 24.5 )}}}
CHECKING our answer***
{{{a[8] = -28 + 24.5 = -3.5}}}
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