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Permutations and Combination

Permutation and Combination: Difference between Permutation and Combination, Permutation Meaning, Permutation and Combination Formula, Questions, Problems

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Online Aptitude Questions with Answers on Permutations and Combination

Q21. **A committee has 5 men and 6 women. What are the number of ways of selecting 2 men and 3 women from the given committee?**

  1.  150
  2.  200
  3.  250
  4.  300
  5.  None of these

Solution : 200
Q22. **A committee has 5 men and 6 women. What are the number of ways of selecting a group of eight persons?**

  1.  165
  2.  185
  3.  205
  4.  225
  5.  None of these

Solution : 165
Q23. **There are 18 stations between Hyderabad and Bangalore. How many second class tickets have to be printed, so that a passenger can travel from any station to any other station?**

  1.  200
  2.  190
  3.  95
  4.  100
  5.  380

Solution : 380
Q24. **A letter lock consists of three rings each marked with six different letters. The number of distinct unsuccessful attempts to open the lock is at the most -.**

  1.  216
  2.  243
  3.  215
  4.  729
  5.  728

Solution : 215

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Q25. **The number of ways in which six boys and six girls can be seated in a row for a photograph so that no two girls sit together is -.**

  1.  (6!)2
  2.  6! * ⁷P₆
  3.  2(6!)
  4.  6! * 7
  5.  None of these

Solution : 6! * ⁷P₆
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