A bag contains 100 balls numbered from 1 to 100. one ball is removed. what is the probability that the number on this ball is odd or greater than 80?

Total number of balls = 100

Number of balls with odd numbers = 50

Number of balls with number greater than 80 = 20

Number of balls greater than 80 and is odd = 10

⇒ Number of favourable outcomes = 50 + 20 - 10 = 60

P (odd or greater than 80) = 60/100 = 3/5

Answer: 3/5