On the third day, there were one-third of the number of bedbugs as the fourth day, so there were 810 / 3 = <<810/3=270>>270 bedbugs.
On the second day, there were one-third of the third day’s bedbugs, so there were 270 / 3 = <<270/3=90>>90 bedbugs.
On the first day, there were 90 / 3 = <<90/3=30>>30 bedbugs in the group to start with.
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