Question

a survey was conducted to know the hobby of 220 stùdents out of which 130 students informed about their hobby as rock climbing and 180 students informed about their hobby as sky watch. There are 110 students who follow both the hobbies. Then how many students do not have any of the two hobbies?How many students follow the hobby of sky watch only ​

Answer 1

Answer:

Number of students who do not like Rock climbing and sky watching=20

students who only like rock climbing=20

students who only like sky watching=70

formula is given

Answer 2

Answer:

7/22

Step-by-step explanation:

P[A]=130/220,

P[B]=180/220,

P[A intersection B]=110/220

P[only B]= P[B]-P[A intersection B]

              =180/220-110/220

              =70/220

               =7/22