# Practice Questions on Permutation-CombinationAptitude Questions and Answers

## Easy Permutation-Combination Question - 11

 Q11. The letter of the word $LABOUR$ are permuted in all possible ways and the words thus formed are arranged as in a dictionary. What is the rank of the word $LABOUR$?
 A. 275 B. 251 C. 240 D. 242

## Easy Permutation-Combination Question - 12

 Q12. There are fourteen juniors and twenty-three seniors in the Service Club. The club is to send four representatives to the State Conference. (i)- How many different ways are there to select a group of four students to attend the conference? (ii)- If the members of the club decide to send two juniors and two seniors, how many different groupings are possible?
 A. (i): ${^{37}C_4}$ , (ii): ${^{14}C_2}×{^{23}C_2}$ B. (i): ${^{37}P_4}$ , (ii): ${^{14}P_2}×{^{23}P_2}$ C. (i): ${^{37}P_4}$ , (ii): ${^{14}C_2}×{^{23}C_2}$ D. (i): ${^{37}C_4}$ , (ii): ${^{14}P_2}×{^{23}P_2}$

## Easy Permutation-Combination Question - 13

 Q13. A class photograph has to be taken. The front row consists of 6 girls who are sitting. 20 boys are standing behind. The two corner positions are reserved for the 2 tallest boys. In how many ways can the students be arranged?
 A. 6! × 1440 B. 18! × 1440 C. 18! ×2! × 1440 D. None of these

## Easy Permutation-Combination Question - 14

 Q14. If $5 × {^nP_3} = 4 × {^{n+1}P_3}$ find $n$?
 A. 10 B. 12 C. 11 D. 14

## Easy Permutation-Combination Question - 15

 Q15. Ten different letters of alphabet are given, words with 5 letters are formed from these given letters. Then, the number of words which have at least one letter repeated is:
 A. 69760 B. 30240 C. 99748 D. 42386
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