This column has the answers to the first 8 questions; my next column will have the answers to the last 8. Anuradha, Belinda and Catarina each takes a hat from the box and places it on her own head. A) If Anuradha sees two yellow hats on Belinda and Catarina, she will know her colour: purple. He will then put either a black or a white hat on each mathematician’s head, but nobody will know what colour hat she herself is wearing. So the penultimate woman knows her hat’s colour, and each successive woman uses the same logic to learn her colour and save her head.

Source: Mint January 23, 2020 17:15 UTC