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To find the 20th term of an arithmetic sequence, you can use the formula:
an = a1 + (n - 1) * d
Given that the first term (a1) is 3 and the common difference (d) is 6 (since each term increases by 6), you can plug in these values into the formula to find the 20th term:
a20 = 3 + (20 - 1) * 6
a20 = 3 + 19 * 6
a20 = 3 + 114
a20 = 117
Therefore, the 20th term of the arithmetic sequence 3, 9, 15, 21, 27, ... is 117.
