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### 1april

Christmas Tree Problem

Four angels sat on the Christmas tree amidst other ornaments. Two had blue halos and two – yellow. However, none of them could see above his head. Angel A sat on the top branch and could see the angels B and C, who sat below him. Angel B, could see angel C who sat on the lower branch. And angel D stood at the base of the tree obscured from view by a thicket of branches, so no one could see him and he could not see anyone either.
Which one of them could be the first to guess the color of his halo and speak it out loud for all other angels to hear?

1. A is frst to guess the color of his halos...as he can see the color of rest of angels....

2. B is first to guess.. Because if A sees two different colors for B and C then B can easily figure out as he has opposite of C color.

3. Two possible cases viz.
1. B & C have halos of same color.
In this case, A will be the first to shout out his halo color which would be different than that of B.

2. B & C have halos of different color.
In this case, A will not be able to guess it correctly. Seeing A is unable to make a guess suggests B that his halo color is different than that of C. So, B will be the first to shout out his halo color which would be different that of C.

4. You guys aren't bright are you...