2. In a school of 160 pupils, 75 have pencils, 87 have pens and 93 have rulers, 25 have both pensils and pens, 30 have both pencils and rulers while 47 have both pens and rulers, each pupil has at least one of the items. a). write the set notation. b) Draw a Venn diagram to illustrate this information c).How many pupils have pencils only​