Question

Tickets numbered from 1 to 20 are written and mixed tthoroughly card is drawn at random find the probability getting a multiple of 3 or 7 or a prime number

Answer 1

Hope this will help you

Here, S = {1, 2, 3, 4, ...., 19, 20}.

Let E = event of getting a multiple of 3 or 5 = {3, 6 , 9, 12, 15, 18, 5, 10, 20}.

 P(E) =n(E)=9.n(S)20

Please mark it as a brainlist answer

Answer 2

multiple of 3 are 3,6,9,12,15,18

multiple of 7 are 7,14

prime number between 1 and 20 are 2,3,5,7,11,13,17,19

therefore probably is 16/20 = 4/5