Question 843121
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Hi
sequence 12,7,2,....-203
Arithemetic, d = -5
{{{a[n]=a[1]+(n-1)*d}}}
{{{a[n]=12+(n-1)*(-5) = -203}}}
      12 - -5n + 5 = -203
       -5n = -220
         n = 44, the number of terms in this sequence
CHECKING our answer***
   12 + 43•(-5) = -203
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