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a = 1
U2 = 3
U3 = 5
Ditanya :
49 = Un?
Jawab :
b = U3 - U2 = U2 - a
b = 5 - 3 = 3 - 1
b = 2
Un = a + (n - 1)b
49 = 1 + (n - 1)2
49 = 1 + 2n - 2
2n = 50
n = 25 (D)
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Diketahui :
a = 1
r = 2
Jawab :
Rumus Un?
Jawab :
Un = a ×
Un = 1 ×
Un = (B)