A bag contains tickets numbered from 1 to 20. Two tickets are drawn. find the probability that i. both the tickets have prime numbers on them ii. on one there is a prime number and on the other there is a multiple of 4.

Explanation

Bag contains tickets numbered from `1−20` then two tickets are drawn
`n(s)=(20)_(C_2)​`


Now, let fk the event that one ticket has prime number & other has multiple of `4`


`n(F)= 8_(C_1)​xx5_(C_1)​`


`P(E)=40/((20)_(C_2)​)=4/(19)​`