Jawaban:
u7 = 4 x u1
a + (7-1)b = 4 x (a)
a + 6b = 4a
a + 6(5) = 4a
a + 30 = 4a
30 = 4a - a
30 = 3a
30/3 = a
10 = a
un = a + (n-1)b
un = 10 + (n-1)5
u9 = 10 + (9-1)5
u9 = 10 + 8.5
u9 = 10 + 40
u9 = 50
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Jawaban:
u7 = 4 x u1
a + (7-1)b = 4 x (a)
a + 6b = 4a
a + 6(5) = 4a
a + 30 = 4a
30 = 4a - a
30 = 3a
30/3 = a
10 = a
un = a + (n-1)b
un = 10 + (n-1)5
u9 = 10 + (9-1)5
u9 = 10 + 8.5
u9 = 10 + 40
u9 = 50