Complete the series.
11, 77, 38.5, 231, (…)
$$ 11 \times 7 = 77 $$
$$ 77 \times 0.5 = 38.5 $$
$$ 38.5 \times 6 = 231 $$
$$ 231 \times 0.5 = 115.5 $$
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