 <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). <yor> A lè ṣe àtúntò ìwé mẹ́wàá ní ọ̀nà mẹ́wàá! Ẹ wo àwọn ìwé méjì tí a mú bí tọkọtaya nígbà náà iye ọ̀nà tí ó dára jùlọ láti mú àwọn ìwé méjì yìí pọ̀ jẹ́ 9! 2! Ìdáhùn tí ó gbẹ̀yìn: (C). 