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The digit cards form a 4-digit number that is divisible by 11. One card is turned over (?). Which digit is on it?

Class 6Divisibility RulesPlaying with Numbers
  • A5
  • B9
  • C1
  • D3

Step-by-Step Solution

For 11, find (sum of digits in odd places from the right) minus (sum in even places): . This must be 0 or a multiple of 11, so . Check: .
Answer: B) 9

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