In how many ways can 21 books on Literature and 19 books on Nature be – McqOptions

MCQOPTIONS

1.	In how many ways can 21 books on Literature and 19 books on Nature be placed in a row on a shelf so that two books on Nature may not be together?
A.	4620
B.	3672
C.	1540
D.	None of the above
Answer» D. None of the above

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