 
 <translate> 10 books can be rearranged in 10! ways consider the two books taken as a pair then number of favourable ways of getting these two books together is 9! 2!
Required probability = 1/5 Final answer: (C). <hau> 10 littattafai za a iya rearranged a 10! hanyoyi la'akari da biyu littattafai dauka a matsayin biyu sa'an nan yawan m hanyoyi na samun wadannan littattafai biyu tare ne 9! 2! Tabbacin da ake buƙata = 1/5 Amsar ƙarshe: (C). 