A maths professor challenges students with a number puzzle sequence: 3, 8, 15, 24, 35, ?. Can you find the mysterious number?

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Roula Khalaf, Editor of the FT, selects her favourite stories in this weekly newsletter.

A recently shared brain teaser has grabbed internet's attention, leaving users puzzled and eager to crack the code. The puzzle, posted on X (formerly Twitter) by the account Brainy Bits Hub, reads ...

The students examined the numbers but couldn’t figure it out immediately. The professor smiled and gave them a hint: “Look at the pattern in how the numbers increase. Focus on the differences ...