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U6 = 2 . 4^6-1
U6 = 2 . 4^5
U6 = 2 . 1024
U6 = 2048
2)Un = ar^n-1
U8 = 20 . 1/2 ^8-1
U8 = 20 . 1/2 ^ 7
U8 = 20 . 1/128
U8 = 0,15625