Quantitative Aptitude Ques 670

Question: On a shelf there are 4 books on Economics, 3 books on Management and 4 books on Statistics. In how many different ways can the books be arranged so that the books on Economics are kept together?

[Punjab and Sind Bank (PO) 2011]

Options:

A) 967680

B) 120960

C) 5040

D) 40320

E) None of these

Show Answer

Answer:

Correct Answer: A

Solution:

  • The 4 books on Economics can be arranged in 4! ways. Considering these 4 books of Economics as one book. The other $ (3+4+1)=8 $ books can be arranged in 8! ways.

$ \therefore $ Total number of ways $ =8!,\times 4! $ $ =40320\times 24=967680 $

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