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Answer:
80
Explanation:
nth term = a + d(n - 1)
20 - 8 = 12
(a + d(10 - 1)) - (a + d(4 - 1)) = 12
a + 9d - a - 3d = 12
6d = 12
d = 2
a + 2(4 - 1) = 8
a + 8 - 2 = 8
a = 2
40th term = 2 + 2(40 - 1) = 2 + 78 = 80
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