Answer:
-976,563.
Explanation:
The common ratio is 15/-3 = -75/15 = 375/-75 = -5.
Sum of n terms = a1. (r^n - 1) / (r - 1)
so S9 = -3 * ((-5)^9 - 1)) / (-5 - 1)
= -976,563.
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