Q91
A book-shelf can accommodate 6 books from left to right. If 10 identical books on each of the languages A,B,C and D are available, In how many ways can the book shelf be filled such that book on the same languages are not put adjacently.
A.
40P6 × 6!
B.
6P4 × 2!
C.
10 × 95
D.
4 × 35
AnswerAnswer: Option D
Solution
Answer: Option D
Solution:
First place can be filled in 4 ways.The subsequent places can be filled in 3 ways each.
Hence, the number of ways
= 4 × 3 × 3 × 3 × 3 × 3
= 4 × 35