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a = -2
b = 4 (Dapat dibandingkan antar suku)
Un = 34
Maka,
Un = a + (n-1)b
34 = -2 + (n-1)4
4(n-1) = 34 + 2
4(n-1) = 36
n-1 = 9
n = 9 + 1
n = 10
Maka, banyak suku ada 10
b=4
Un=34
Un=a+(n-1)b
34=-2+(n-1)4
36=4n-4
40=4n
n = 10