During month 6 there are three mature rabbits, which give birth to three more rabbits. Those, plus the two immature rabbits yields eight rabbits, total.
| Month | ||||||||||
|---|---|---|---|---|---|---|---|---|---|---|
| 1 | 2 | 3 | 4 | 5 | 6 | 7 | 8 | 9 | 10 | |
| Female Rabbits | 1 | 1 | 2 | 3 | 5 | 8 | ||||
In any month N, the number of mature rabbits (all of which will give birth) is the total number of rabbits under month N-2.
In the picture, all rabbits born in month 4 or before give birth to a baby (labeled month 6).
To get the total number of rabbits for month N, add the number of births to the total number of rabbits in month N-1.
In the picture, add the number of babies (3) to the number of rabbits born month five or earlier (5).
How many rabbits are there for month 7?