self Maths Puzzle

Place 10 balls in 5 lines in such a way that each line has exactly 4 balls on it.

Read Solution (Total 2)

Put Star and place each ball in every point..
12 years agoHelpfull: Yes(3) No(2)

Draw a lines like star
10 years agoHelpfull: Yes(0) No(0)

self Other Question

At a restaurant downtown, Mr. Red, Mr. Blue, and Mr. White meet for lunch. Under their coats
they are wearing either a red, blue, or white shirt.

Mr. Blue says, "Hey, did you notice we are all wearing different colored shirts from our names?" The man
wearing the white shirt says, "Wow, Mr. Blue, that's right!"

Can you tell who is wearing what color shirt? The first box has two white balls. The second box has two black balls. The third box has a white and a black ball.

Boxes are labeled but all labels are wrong!

You are allowed to open one box, pick one ball at random, see its color and put it back into the box, without seeing the color of the other ball.

How many such operations are necessary to correctly label the boxes?