Math
posted by Tracy .
A pair of newborn male and female rabbits is placed in an enclosure to breed. The rabbits start to bear young ONE MONTH after their own birth. At the end of each month, they have another malefemale pair, which in turn mature and start to bear young ONE MONTH later. None of the rabbits die. How many rabbits will there be at the end of SIX MONTHS from the start?

End of month 1: 2 pair
Month 2: 4 pair
Month 3: 8 pair
Month 4: 16 pair
Month 5: 32 pair
Month 6: 64 pair = 128 rabbits