The amount by which the bugs increase increases by 1 each time.
So the sequence goes:
1, 3, 6, 10, 15, 21, 28...
So there are 21 bugs on Saturday
there are 21 bugs on Saturday ;
David will have 21 bugs in his collection on Saturday. This is calculated by identifying the pattern in the number of bugs collected each day. The pattern shows that the increase in the number of bugs grows by 1 each day.
;