Question: 1 2 : 1 + a + a 2 + a 3 + a n - 1 = a n - 1 a - 1

12: 1+a+a2+a3+an-1=an-1a-1 for a??===0,1
12: 1+a+a2+a3+an-1=an-1a-1 for a??===0,1

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