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Multiplying a 3 digit number (ABC) by 11:

ABC x 11 = A_(A+B)_(B+C)_C eg 452 x 11 = 4972 4_(4+5)_(5+2)_2 = 4972

Does it work with more than 3 digits?

Does this always work?

Can you prove it?

in GMAT Problem Solving by Platinum (113k points) | 55 views

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