-8, 32, -128,....: -8, 32, -128,...., an =an-1 (-4), an = -8 (-4)n-1, -2, 10, -50, ......: -2, 10, -50, ......, an =an-1 (-5), an =-2 (-5)n-1, 40, 10, 5/2, 5/8, ....: 40, 10, 5/2, 5/8, ...., an =an-1 (1/4), an =40 (1/4)n-1, 37, 32, 27, 22, ....: 37, 32, 27, 22, ...., an =an-1 - 5, an = 37 - 5(n-1),

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