Ok, so
We know that the first term ( a1 ) is 8, and the common difference is 3.
So, we replace in the equation:
(a20) = 8 + 3 ( 20 - 1 )
(a20) = 8 + 3*19
(a20) = 65
So, the 20th term of the aritmetic sequence is 65.
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