A bird keeper has got P pigeons, M mynas and S sparrows.
The keeper goes for lunch leaving his assistant to watch the birds.

Suppose p=10, m=5, s=8 when the bird keeper comes back, the assistant informs the x birds have escaped. The bird keeper exclaims: "Oh no! All my sparrows are gone."
How many birds flew away?
When the bird keeper comes back, the assistant told him that x birds have escaped. The keeper realised that atleast 2 sparrows have escaped.
What is minimum no of birds that can escape?

• 
  
  
  This question can be solved using the pigeonhole principle. I guess the answer for the first question is 23(10+5+8). Since if all the birds are escaped,then only he can be sure that all sparrows are gone. And for the second one,answer is 17(10p+5m+2s).if 17 birds escaped then best case such that least number of sparrows escaped will be like 10 pigeon,5 myna and 2 sparrows escaped.
  
• 10 years agoHelpfull: Yes(20) No(1)
• I think
  1.if exclaimation is like"Oh no! All my sparrows are gone".It implies that he has seen no sparrows in the group of birds.It means that all sparrows has gone as well as some of the pigeons and mynas may also has flown.So atleast 8 birds has escaped.
  2.Here," The keeper realised that atleast 2 sparrows have escaped." it implies that all pigeons and mynas has escaped and he is unable to see atleast 2 sparrows.So atleast 17 birds has escaped.
• 10 years agoHelpfull: Yes(11) No(1)
• Answer is 5 Birds.
• 10 years agoHelpfull: Yes(6) No(10)
• i think ans is 2 as minimum no of birds are asked
  
• 10 years agoHelpfull: Yes(6) No(3)
• i)8 birds flew away
  ii)2 flew away
• 6 years agoHelpfull: Yes(2) No(0)
• what is the correct answer
  
• 9 years agoHelpfull: Yes(1) No(3)
• pls explain this
• 10 years agoHelpfull: Yes(0) No(1)
• explain this prob
• 10 years agoHelpfull: Yes(0) No(0)
• answer should be 2 only
• 10 years agoHelpfull: Yes(0) No(5)
• bird keeper has got P pigeon, M mynas and S sparrows. The keeper goes for lunch leaving his assistant to watch the birds. Suppose P = 10, M = 5, S = 8. When the bird keeper comes back, before he has the chance to see the birds, the assistant informs him 2 things.
  
  a.) that x birds have escaped. The bird keeper without looking at the birds, exclaims oh no! all my sparrows are gone. How many birds flew away?
  
  b.) that x birds have escaped. The bird keeper without looking at the birds, realized that at least 2 sparrows have escaped.
  THIS IS THE CORRECT QUESTION
• 6 years agoHelpfull: Yes(0) No(2)