Analytics Strategist

September 17, 2015

Cheryl’s Birthday Riddle – the Sequel

Filed under: Puzzles — Tags: , , , , — Huayin Wang @ 6:49 pm

Rumor has it that Cheryl was not happy about the way Albert and Bernard sharing information through their seemingly innocuous comments in the Cheryl’s Birthday Riddle (CBR) game.

“That was cheating!” said Cheryl.  “I would’ve been really impressed if you’d done it without all the trick.”  Upon hearing this, Albert and Bernard fell into deep thought.  A long silence later, Bernard said, “Cheryl, pick any date from that list, I’ll be able to find it out”; “with your help of course”, Bernard winked.  And thus began the sequel to CBR:

Cheryl determined to make sure no information is leaked; she put each date on a piece of paper, month written on one side and day written on the other side; and all ten pieces in a hat.

Cheryl picked a date from the hat, showed Albert the month and Bernard the day, without looking at the date herself.

Cheryl asked Bernard, “So, do you know the date?”  “No, not yet,” replied Bernard.

Cheryl turned to Albert:  “Do you know it?”  “Neither do I,” Albert replied.

Cheryl smiled, “I guess nobody in this room knows the date”.

Bernard piped up:  “Actually, I think I know it now.”

Albert: “I am still in the dark.”

Cheryl: “Good, I am not the only one.”

Bernard: “Now, I am certain I have it right”

Albert: “Ok, I know it too.”

“Me three”, said Cheryl, wearing a big smile on her face.

All three of them had the same date.  What is it?

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