Fast bowler Hasan Mahmud claimed his maiden five-for as Bangladesh defeated Ireland by 10 wickets.
It means the hosts claim the one-day international series 2-nil after their first ever 10-wicket victory over any side.
Bangladesh won the first match by 183 runs for its largest ODI victory and the second match was washed out.
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The tour moves along to a three-match T20 series starting on Monday, followed by a Test match in Dhaka next month.
