I have two children. One is a boy born on a Tuesday. What’s the probability that the other is a boy?

Gary Foshee, G4G 2010(?)

Boy Boy

Boy Girl

Girl Boy

“There are two X, [at least] one is a Y”

“He has two ex-girlfriends who stalk him. One of them has contacted me....”

“Henry VIII had two wives called Anne, one of them was beheaded....”

“I have two in my team, one is a bloke with a physics degree,

“You have a choice of fruit, one is a banana going soft at one end...

the other is a bloke with no qualifications”

the other is an apple with a wasp hole in it.”

“There are two X, at least one is a Y”

“I have two children, at least one of them isn’t a layabout.”

‘At least’ means ‘Thank goodness’

“In the international ‘Feline Beauty’ competition, at least one of the cats was adorable.” Daily Mail.

“There are two X, at least one is a Y”

“I can’t believe what his parents did to him, at least one of them was a murderer.”

Most common occurrence of ‘two…at least one’ is the Tuesday-boy puzzle

“There are two X, at least one is a Y”

Two of my children are going to parties today. At least one is a girl born on a

Thursday. Is the other one a boy or a girl?