U12 = 3 + 1 = 5
U12 = 5 + 2 = 7
U12 = 7 + 2 = 9
U12 = 9 + 2 = 11
U12 = 11 + 14 =
U12 = 25 ✅
Un = a + (n - 1) b
a → 3
b → 2
n → 12
U12 = 3 + (12 - 1)2
U12 = 3 + (11)2
U12 = 3 + 22
U12 = 25
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U12 = 3 + 1 = 5
U12 = 5 + 2 = 7
U12 = 7 + 2 = 9
U12 = 9 + 2 = 11
U12 = 11 + 14 =
U12 = 25 ✅
____________________________
Un = a + (n - 1) b
a → 3
b → 2
n → 12
U12 = 3 + (12 - 1)2
U12 = 3 + (11)2
U12 = 3 + 22
U12 = 25
:)