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= 5 (4^6 - 1) : 4-1
= 5 ( 256- 1) : 3
= 5 (255) : 3
= 1275 : 3
= 425
2. Un = a x r^n-1
= 2 x 4^6-1
= 2 x 4^5
= 2 x 1024
= 2048