What color stamps does B have?

114 views

The Grand Master takes a set of 8 stamps, 4 red and 4 green, known to the logicians, and loosely affixes two to the forehead of each logician so that each logician can see all the other stamps except those 2 in the Grand Master's pocket and the two on her own forehead. He asks them in turn if they know the colors of their own stamps:
A: "No."
B: "No."
C: "No."
A: "No."
B: "Yes."
What color stamps does B have?

posted Sep 2, 2014

Based on some Assumptions there might be 1 Green Cap and 1 Red Cap on B's Head.

Similar Puzzles

Rohan's Sock Drawer boasts 18 Black Socks,10 Yellow, 8 Orange, 34 White and 2 Violet,not sorted by color.

The Light bulb has burned out.
Rohan cannot see what color the Socks are.

How many Socks does Rohan have to take to be sure he has at least two Socks of the same color ?

Jim keeps all his ties in a drawer.

He has 7 yellow, 10 blue, 9 red, 20 green and 3 purple colored ties.

He does not sort and keep them.

There is a power outage and Jim needs 2 ties of the same color.

Since he cannot see which color he is picking up from the drawer, how many ties does Jim have to take to be sure that he has at least 2 ties of the same color?