# 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

Q16. **How many three letter words are formed using the letters of the word TIME?**

1.  12
2.  20
3.  16
4.  24
5.  30

Solution : 24
Q17. **Using all the letters of the word "THURSDAY", how many different words can be formed?**

1.  8
2.  8!
3.  7!
4.  7
5.  6!

Solution : 8!
Q18. **Using all the letters of the word "NOKIA", how many words can be formed, which begin with N and end with A?**

1.  3
2.  6
3.  24
4.  120
5.  12

Solution : 6
Q19. **The number of arrangements that can be made with the letters of the word MEADOWS so that the vowels occupy the even places?**

1.  720
2.  144
3.  120
4.  36
5.  204

Solution : 144

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Q20. **The number of permutations of the letters of the word 'MESMERISE' is_.**

1.  9!/(2! 2! 3!)
2.  9!/(2! 2! 2! 3!)
3.  9!/(2! 2! 3! 3!)
4.  5!/[(2!)^2 3!]
5.  8!/[(2!)^2 (3!)^2]

Solution : 9!/(2! 2! 3!)
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