Discussion about math, puzzles, games and fun. Useful symbols: ÷ × ½ √ ∞ ≠ ≤ ≥ ≈ ⇒ ± ∈ Δ θ ∴ ∑ ∫ • π ƒ ¹ ² ³ °
 

You are not logged in. #1 20050715 15:42:13
rabbit farmI found this puzzle on web, no solutions : Last edited by tt (20050715 15:44:51) #2 20050715 15:47:58
Re: rabbit farmThis is much more complicated than what I thought! Last edited by ganesh (20050715 16:54:00) Character is who you are when no one is looking. #3 20050715 17:15:16
Re: rabbit farmWork out how many rabbits you get over the first few months. Notice any patterns? Why did the vector cross the road? It wanted to be normal. #4 20050715 17:41:49
Re: rabbit farmYou mean 144? My friend says it is ___! Last edited by ganesh (20050715 17:42:20) Character is who you are when no one is looking. #5 20050715 17:43:03
Re: rabbit farmYes, but it was meant to be a subtle hint. Why did the vector cross the road? It wanted to be normal. #6 20050715 17:43:57
Re: rabbit farm0 months: 2 Adults, 2 Babies "The physicists defer only to mathematicians, and the mathematicians defer only to God ..."  Leon M. Lederman #7 20070318 10:16:56#8 20070318 10:36:36
Re: rabbit farm172 rabbits?
Fibonacci! #9 20070318 10:56:56
Re: rabbit farmThis is becoming very interesting. I get 178. Why did the vector cross the road? It wanted to be normal. #10 20070318 11:03:59
Re: rabbit farmOkay, assume we start with a male–female pair and all babies are born as malefemale pairs. #11 20070318 11:09:40
Re: rabbit farmAll right, I see something there. I have assumed that the rabbits become mature at the end of two months, but don’t start reproducing at two months yet – i.e. they start reproducing only in their third month. (I mean, I’ve assumed that the rabbits are born at the end of each month and reach maturity at the end of two months – so they wouldn’t have time yet to reproduce.) Last edited by JaneFairfax (20070318 11:28:12) #12 20070318 11:32:39
Re: rabbit farmHaha, I can't add properly! I actually got 178 too. Code:month a j b t 1) 1 1 2) 1 1 2 3) 1 1 1 3 4) 2 1 2 5 5) 3 2 3 8 6) 5 3 5 13 7) 8 5 8 21 8) 13 8 13 34 9) 21 13 21 55 10) 34 21 34 89 With the letters representing the same things as Jane's, in pairs. And 't' being the total number of pairs. #13 20070318 11:38:01
Re: rabbit farmThe month numbers you have there are for the beginning of the month. Thus your month 10 would mean beginning of that month, meaning only 9 full months have passed. Since the question wants 10 months, I think you should add another month’s calculation … which should bring the total number of rabbits to 288. #14 20070318 11:43:16
Re: rabbit farmYes, I see. If the month numbers there are for the end of the month, I have assumed that the rabbits don't reproduce in the first month. So, do the rabbits reproduce in the first month? 