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Multiple Choice

There are 6 pairs of black gloves and 5 pairs of white gloves. They all are put into a box and gloves are drawn one at a time. To ensure that at least one pair of black gloves is drawn out, what is the number of gloves required to be drawn out?

  1. 7
  2. 11
  3. 12
  4. 13
  5. 17
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