STICKELERS

Toronto Star - - PUZZLES - BY TERRY STICK­ELS

If a fam­ily has two chil­dren and the older child is a girl, there is a 50 per­cent chance this fam­ily has two girls. But what if I make the fol­low­ing state­ment?

“In a fam­ily with two chil­dren, we know that one child is a girl. What is the prob­a­bil­ity the sec­ond child is a girl?”

Is this state­ment equiv­a­lent to the first state­ment? Is the prob­a­bil­ity still 50 per­cent or a dif­fer­ent percentage?

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