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The first term (a1) and the common ratio (r) of a geometric sequence are given. Find the specified term using the general term (nth term) formula.Find a15 when a1 = 4, r = -3.

The first term (a₁) and the common ratio (r) of a geometric sequence are given. Find the specified term using the general term (n^th term) formula.
Find a₁₅ when a₁ = 4, r = -3.