Question

Eight identical coasters are placed on a table. Each coaster is of blue color on one side and pink color on its other side. All the eight coasters are placed in such a manner that the blue color is on the upper side. In a single try, exactly six (neither more nor less) coasters are turned upside down. Find out the Ieast number of tries in which the coasters can be turned upside down, such that all the eight coasters show pink color on the upper side?
A) 3
B) 5
C) 7
D) This cannot be achieved

Answer 1

A 3 because already they have turned all the 6 coasters then more 2 are out

So, if we take single single coasters then it takes 2 tries

That's it so the answer is A

Answer 2

Answer:

A) 3

Step-by-step explanation:

b represents "blue on upper side"

P represents "pink on upper side"

bbbbbbbb

--> PPPPPPbb      [ flipped first 6 ]

--> PbbbbbPb       [ flipped middle 6 ]

--> PPPPPPPP      [ flipped the 6 b's ]