A good answer might be:

At the end of the second month, your female rabbit has just become mature. She will give birth to one female rabbit at the start of the next month. (This is a one day long pregnancy. This is biologically unlikely, but let us ignore that.)

End of Month Two

Recall the rules:

A female rabbit matures after 2 months.
Each mature female rabbit produces 1 baby female rabbit the first day of every month.

The chart shows the situation at the end of the second month. Your single female rabbit has just become mature. Assume that this fact has not gone unnoticed by the male rabbits.

N	1	2	3	4	5	6	7	8	9	10
Rabbits	1	1

QUESTION 10:

How many female rabbits are there at the end of the third month?