# Permutations and Combinations Questions - Permutation and Combinations

36:

There are three identical red balls and fouridentical blue balls in a bag. Three balls are down. The number of different colour combination is

 A. 20 B. 35 C. 40 D. 30 Answer Report Discuss Option: D Explanation : Click on Discuss to view users comments. Write your comments here:
37:

How many five different letter words can be formed out ofthe word "LOGARITHMS"?

 A. 20120 B. 30120 C. 30240 D. 40840 Answer Report Discuss Option: C Explanation : Total letters in the word "LOGARITHMS" is 10,i.e. n=10 and we have to form five-letter words r = 5 Required number of words,            = 10 x 9 x 8 x 7 x 6            = 30240 Click on Discuss to view users comments. Write your comments here:
38:

Given npr = 3024

Value of r will be

 A. 3 B. 4 C. 6 D. 9 Answer Report Discuss Option: B Explanation : Since npr is product of consecutive positive integers. npr = 3024 = 9 x 8 x 7 x 6 Hence,        r = 4 Click on Discuss to view users comments. Write your comments here:
39:
In a factory for five jobs the members A, B, C, D, E are eligible.
First three jobs can be filled in how many ways?
 A. 20 B. 30 C. 60 D. 120 Answer Report Discuss Option: C Explanation : First three jobs can be filled by 5 members in 5P3 ways. Number of ways of filling the first 3 jobs  5P3 = 5 x 4 x 3 = 60 ways Click on Discuss to view users comments. Write your comments here:
40:

How many ways can 5 men and 3 women be seated in a row so that two women cannot sit side by side?

 A. 120 B. 240 C. 1200 D. 14400 Answer Report Discuss Option: D Explanation : Click on Discuss to view users comments. Write your comments here:

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