the given series is,
32, 25, 18, 11...
first term a = 32
common difference = 25 - 32 = -7
so, the next 3 terms are,
11 - 7 = 4
4 - 7 = -3
-3 - 7 = -10
thus, the next three terms are 4 , - 3 , -10
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