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Symbiosis National Aptitude Test SNAP 2019 Paper
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© examsnet.com
Question : 41
Total: 110
In how many ways can 10 books on Mechanics and 8 books on quantum physics be placed in a row such that two books on quantum physics may not be together.
165
176
187
198
Validate
Solution:
10 books on Mechanics can be arrange in following ways.
–
M
1
–
M
2
–
M
3
–
M
4
–
M
5
–
M
6
–
M
7
–
M
8
–
M
9
–
M
10
–
It quantum physics are placed at my vacent place (marked by '–') then no two quantum physics books will be placed together.
Number of ways
11
C
8
=
11
×
10
×
9
3
×
2
= 165
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