Dilip DSouza

In any set of five randomly selected positive integers, what are the chances of adding up three and ending up with…

Recently, a friend asked me to buy some DVDs of old Hindi films and send them to him in Delhi. The purchase was…

My father’s all-time favourite joke always made us roll our eyes. It went like this: God said to Moses, “Come…

One famous story about the great logician Raymond Smullyan (1919-2017) is from the time someone introduced him as…

Two tribes, two traditions, two replies. Your escape route depends on how well you can tell the truthers from the…

Use a die to generate different six-digit numbers. Can you figure out how many different six-digit numbers you…

A geometric puzzle should ordinarily appear with a diagram. But not this one, because visualising it in your mind…

An old chestnut of a puzzle that we used to puzzle over as schoolkids involves an elastic rope and an intrepid…

My phone was recently subjected to an inadvertent bout of swimming. The result: a very dead instrument. So I asked…

On a recent trip to Chennai, I took the Metro to and from the airport. At the airport, a long corridor connects…