baris aritmatika :
-8 , -5 , -2 , ... , 73
a = -8
b = -5 - (-8)
b = -5 + 8
b = 3
Un = 73
Un = a + (n - 1)(b)
73 = -8 + (n - 1)(3)
73 = -8 + 3n - 3
73 = -11 + 3n
3n = 73 + 11
3n = 84
n = 84/3
n = 28
jadi , banyak suku barisan tersebut adalah 28 suku
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baris aritmatika :
-8 , -5 , -2 , ... , 73
a = -8
b = -5 - (-8)
b = -5 + 8
b = 3
Un = 73
Un = a + (n - 1)(b)
73 = -8 + (n - 1)(3)
73 = -8 + 3n - 3
73 = -11 + 3n
3n = 73 + 11
3n = 84
n = 84/3
n = 28
jadi , banyak suku barisan tersebut adalah 28 suku