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    http://www.gulfup.com/?WZIcLh



    (a + 3 d ) (a + 8 d ) = 20 →a+3d a- 8d =20 → - 5 d= 20→ d = -4


    a + d = 2 ( a+ 3 d ) →a 4 = 2a -24 →a= 20

    <20 , 16 ,12, 8 , 4 , 0 , -4 , -8 , -12 , . . . >
    ; 11-18-2013 11:41 PM

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