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Un = a + (n-1)b
a). Diketahui:
a = 1, b = 3
Ditanya:
U10 = ?
Jawab:
U10 = 1 + (10-1)3
U10 = 1 + (9)3
U10 = 1 + 27
U10 = 28
b). Diketahui:
a = 3, b = 2
Ditanya:
U50 = ?
Jawab:
U50 = 3 + (50-1)2
U50 = 3 + (49)2
U50 = 3 + 98
U50 = 101
c). Diketahui:
a = 14, b = -4
Ditanya:
U75 = ?
Jawab:
U75 = 14 + (75-1)-4
U75 = 14 + (74)-4
U75 = 14 + (-296)
U75 = -282
Khusus untuk soal no,d dan e ini gunakan rumus:
Un =
d). Diketahui:
a = 1, r = 3
Ditanya:
U8 = ?
Jawab:
U8 =
U8 =
U8 =
U8 = 128
e). Diketahui:
a = 36, r = 1/3
Ditanya:
U8 = ?
Jawab:
U8 =
U8 =
U8 =
U8 =
U8 =
U8 = 0,0164
f). Diketahui:
a = 1/3, b = 2/3
Ditanya:
U12 = ?
Jawab:
U12 = 1/3 + (12-1)2/3
U12 = 1/3 + (11)2/3
U12 = 1/3 + 22/3
U12 = 23/3