Calculator Tricks 4. By Brian Carruthers (Please see notes on slide 1). Lucky 7. or Unlucky 13. Step One. Think of a three-digit number Enter it twice on your calculator. For example: 123123 Now concentrate on the display. Step Two. I think that your number is divisible by 11.
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(Please see notes on slide 1)
Am I right?
Your final answer will be :