Fred Has A bag Of Sweets:
 Contents:
 3 Yellow Sweets
 5 Green Sweets
 7 Red Sweets 
 4 Purple Sweets
 1 Black Sweet
 He Is Going To Take A Sweet From The Bag At Random,
 a.) What is The Possibility That He Will Get A Black Sweet?
 b.) Write The Missing Colour In The Sentence Below:
 The Possibility Fred Will Get A ______ Sweet Is 1/4