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1a . Un = 16.1/2
U7 = 16.1/2
= 16. 1/64
= 1/4
1b. Un = 5. 1/3
U6 = 5. 1/3
= 5. 1/243
= 5/243
1c. Un = -2. 2
U8= -2. 2
= -2. 128
= -256
U6 = 5 + (6-1) 3
U6 = 5 + 15
U6 = 20
c. U8 = a + (n-1) b
U8 = -2 + (8-1) 2
U8 = -2 + 14
U8 = 12