Solution
Pattern of series,
$$({9}\times{0.5}) + 1$$ = 5.5
$$({5.5}\times{1}) + 2$$ = 7.5
$$({7.5}\times{2}) + 4$$ = 19
$$({19}\times{4}) + 8$$ = 84
$$({84}\times{8}) + 16$$ = 688
therefore the answer is 688
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