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P.G.(1024,512 ; 256 ; 128 )
q = 1/2
S 4 = 1920
S n = a 1 ; (q^n - 1 ) / q - 1
S 4 = a 1 . (1/2)^4 - 1 ) / 1/2 - 1
1920 = a 1 . ( 1/16 ) - 1 / 1/2 - 2/2
1920 = a 1 . (1/16 - 16/ 1 6 ) / -1/2
1920 . -1/2 = a 1 . -15/16
-1920/2 = a 1 . - 15/16
- -960 = a 1 . - 15/16
a 1 . (-15/16) = -960
a 1 = -960 : (-15/16)
a 1 = -960 . (- 16/15)
a 1 = + 15360 / 15
a 1 = + 1024
a 2 = a 1 . 1/2 = 1024 . 1/2 = 1024/2 = 512
a 3 = a 2 . 1/2 = 512 . 1/2 = 512/2 = 256
a 4 = a 3 . 1/2 = 256 . 1/2 = 256 / 2 = 128
q = 1/2
S 4 = 1920
S n = a 1 ; (q^n - 1 ) / q - 1
S 4 = a 1 . (1/2)^4 - 1 ) / 1/2 - 1
1920 = a 1 . ( 1/16 ) - 1 / 1/2 - 2/2
1920 = a 1 . (1/16 - 16/ 1 6 ) / -1/2
1920 . -1/2 = a 1 . -15/16
-1920/2 = a 1 . - 15/16
- -960 = a 1 . - 15/16
a 1 . (-15/16) = -960
a 1 = -960 : (-15/16)
a 1 = -960 . (- 16/15)
a 1 = + 15360 / 15
a 1 = + 1024
a 2 = a 1 . 1/2 = 1024 . 1/2 = 1024/2 = 512
a 3 = a 2 . 1/2 = 512 . 1/2 = 512/2 = 256
a 4 = a 3 . 1/2 = 256 . 1/2 = 256 / 2 = 128
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