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On 18 June 1980, at Imperial College London, Shakuntala Devi set a Guinness World Record by doing what?

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1. On 18 June 1980, at Imperial College London, Shakuntala Devi set a Guinness World Record by doing what?

Correctly multiplying two 13-digit numbers in 28 seconds

Finding the square root of a 100-digit number in one minute

Reciting pi to 10,000 decimal places

Solving a Rubik’s Cube blindfolded in under 20 seconds

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