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This is an Arithmetic Progression with a first term (a) of 3, and a common difference (d) of 5.
The formula for the nth term is a(n) = a + (n - 1)d.
Then, 78 = 3 + 5(n - 1) = 3 + 5n - 5 = 5n - 2
Thus, 5n = 78 + 2 = 80
And so, n = 80/5 = 16
The 16th term of this AP is 78.
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