1.

Thereare 3 copies of eachof 4differentbooks. Thenumber ofwaysthattheycan bearrangedin ashelfis

Answer»

`(12!)/(3!)^(4)`
`(11)/((3!)^(2))`
`(9)/((3!)^(2))`
`(12!)/((3!)^(5))`

ANSWER :A


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