Question

tickets numbered 1 to 20 are mixed up and then a ticket is drawn at random What the
probability that the ticket drawn has a number which is a multiple of 3 or 5​

Answer 1

Answer:

Number divisible by 3 or 5 are = {3,5,6,9,10,12,15,18,20}

i.e. any ticket drawn random divisible by 3 or 5 has probability 9/20 i.e. 0.45