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a)
Un = a + (n-1)b
U2 = a + (2-1)b
6 = a + b
U11 = a + (11 - 1)b
24 = a + 10 b
eliminasi a
6 = a + b
24 = a + 10b
__________ -
-18 = -9b
b = -18/-9
b = 2
substitusi b = 2 ke
6 = a + b
6 = a + 2
a = 6 - 2
a = 4
suku pertama = 4, beda = 2
b)
U40 = 4 + (40 - 1)2
U40 = 4 + (39 × 2)
U40 = 4 + 78
U40 = 82
c)