Detailed Instructions: In this task, you need to provide the correct option for a given problem on probability from the provided options.
Q: Problem: a father purchased dress for his 3 daughters . the dresses are of same color but diff size and they are kept in dark room . what is probability that all the 3 will not choose there own dress ? 
Options: a ) 1 / 3 , b ) 2 / 3 , c ) 1 / 2 , d ) 3 / 4 , e ) 3 / 7
A:
a