Question

one ticket is drawn at random from a bag containing 20 tickets numbered 1 to 20 . find the probability that the number on the ticket is (a)the prime number (b)multiple of 4 (c)divisible by 5​

Answer 1

Answer:

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Answer 2

Given,

Total number of tickets = 20

To Find,

Probability of getting the prime number =?

Probability of getting a number multiple of 4 =?

Probability of getting a number divisible by 5​ =?

Solution,

Total possible outcomes  = 20

We know the formula of probability that is

Probability = Number of favorable outcomes  / Total outcomes

Number of prime numbers between 1 - 20 =  8

Probability of getting a prime number  = 8 / 20 = 2 / 5

Numbers that are multiples of 4 between 1 - 20 = 5

Probability of getting a number multiple of 4 = 5 / 20 = 1 / 4

Numbers that are divisible by 5 between 1 - 20 = 4

Probability of getting a number divisible by 5 = 4 / 20 = 1 / 5

Hence, the probability that the number on the ticket is the prime number, multiple of 4 and divisible by 5​ is 2/5, 1/4, and 1/5 respectively.