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Class 11

Combinations and Selection Problems, Quiz

Five questions on combinations and selection problems. Pick one answer for each.

5 questions, one mark each. 3 to pass. Suggested time: 10 minutes. Your answers are not recorded.

  1. Evaluate 9C3^9C_3.
  2. If nC8=nC6^nC_8 = {}^nC_6, find nn.
  3. A committee of 44 is chosen from 55 men and 44 women. In how many ways can it have exactly 22 women?
  4. 88 points lie in a plane, no three collinear. How many triangles have their corners among them?
  5. How many diagonals does an octagon have?
Unanswered questions are marked wrong.

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