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Sagot :

Answer:

Step-by-step explanation:

The eights term is 12  .....   nine more terms added to this becomes 15

so the common difference, d = 3/9 = 1/3 ....each term has 1/3 added to it to find the next term .    Then a1 = 12 - 7/3 = 9 2/3

the equation is then

an = 9  2/3  +  (1/3) (n-1)     WHICH CAN BE WRITTEN

         9 1/3  - 1/3 n