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= 9 + (n-1) 1
= 9 + 1n - 1
= 1n + 8
maaf kalau salah!!
4+5 , 8+2 , 16-1 , 32-4 , 64-7, 128-10........... kelipatan 2 n pengurangan 3
4+(5), 8+(5-3), 16+(5-6), 32+(5-9), 64+(5-12), 128+(5-15)
Un = 2⁽¹⁺ⁿ⁾ + (5-3(n-1))
= 2.2ⁿ + 8 - 3n