Cheryl's Birthday

[Spiri.Of.Genius]

CAN YOU CRACK THIS MATHS OLYMPIAD QUESTION? JUST RE POSTING IT!

Albert and Bernard just became friends with Cheryl, and they want to know when her birthday is. Cheryl gives them a list of 10 possible dates.

May 15	May 16	May 19
June 17	June 18
July 14	July 16
August 14	August 15	August 17

Cheryl then tells Albert and Bernard separately the month and the day of her birthday respectively.

Albert: I don't know when Cheryl's birthday is, but I know that Bernard does not know too.

Bernard: At first I don't know when Cheryl's birthday is, but I know now.

Albert: Then I also know when Cheryl's birthday is.

So when is Cheryl's birthday?

[Sensei]

On 15.01.2018 at 10:58 AM, Spiri.Of.Genius said:

So when is Cheryl's birthday?

17 June

 

Albert got June,

Bernard got 17.

(if Bernard would get 18 or 19, he would know exact day without having to know month, as they're unique)

[1x0]

Jun 18

On 2018. 01. 24. at 8:09 PM, Sensei said:

(if Bernard would get 18 or 19, he would know exact day without having to know month, as they're unique)

right.

[TakenItSeriously]

A third person can deduce it must be July 16 using all three clues.

Edited March 30, 2018 by TakenItSeriously