TASK DEFINITION: In this task, you need to provide the correct option for a given problem on probability from the provided options.
PROBLEM: Problem: in how many ways can 21 books on english and 19 books on french be placed in a row on a shelf so that two books on french may not be together ? 
Options: a ) 3990 , b ) 1540 , c ) 1995 , d ) 3672 , e ) none of these

SOLUTION: b

PROBLEM: Problem: how many cubes of 8 cm edge can be cut out of a cube of 16 cm edge 
Options: a ) 36 , b ) 2 , c ) 8 , d ) 48 , e ) none of these

SOLUTION: c

PROBLEM: Problem: a bag contains 3 red , 5 yellow and 4 green balls . 3 balls are drawn randomly . what is the probability that the balls drawn contain balls of different colours ? 
Options: a ) 2 / 7 , b ) 3 / 5 , c ) 3 / 11 , d ) 1 / 4 , e ) 7 / 16

SOLUTION:
c