Question 879729
{{{a[n] = a[1] + (n-1)d}}}
{{{a[3] = a[1] + (2)d = 101}}}
{{{a[4] = a[1] + (3)d = 83}}} SUBTRACT EQs
      -d = 18, d = -18 and a[1] = 137 {{{a[1] + (2)(-18) = 101}}}
{137, 119, 101, 83, 65,...}