Tuesday, October 09, 2007

LOGIC PUZZLE

Bird-watchers explore a forest to see which of the following six kinds of birds―grosbeak, harrier, jay, martin, shrike, wren―it contains. The findings are consistent with the following conditions:

  1. If harriers are in the forest, then grosbeaks are not.
  2. If jays, martins, or both are in the forest, then so are harriers.
  3. If wrens are in the forest, then so are grosbeaks.
  4. If jays are not in the forest, then shrikes are.

If both martins and harriers are in the forest, then which one of the following must be true?

(A) Shrikes are the only other birds in the forest.

(B) Jays are the only other birds in the forest.

(C) The forest contains neither jays nor shrikes.

(D) There are at least two other kinds of birds in the forest.

(E) There are at most two other kinds of birds in the forest.

2 comments:

E. Bilien said...

Not sure about the answer? Send a mail, i'll give it to you;-)
My mail is easily found on the blog... Blog Story

camille said...

je suis déjà habituellement nulle en devinette quand elles sont en francais, alors en anglais.......

for me It's F....
there are always birds in a forest
;-)