Question

A number 1 to 20 are written on 20 separate slips and put in a box one slip is randomly choosen from the box.find the probability of getting a) a number which is multiple of 3 and not of 9 (b) Not a prime number

Answer 1

Answer:

(a) P (multiple of 3 but not 9) = 4/20 = 1/5

(b) P (not a prime number) = 11/20

hope it helps you :-)✌

Answer 2

Answer:

A) 1/5

B) 1/2

Step-by-step explanation:

A) multiples of 3 till 20 (and not of 9) : 3, 6 , 12, 15, (4 in total)

Probability = # favourable outcomes / # of total outcomes

= 4/20 or 1/5

B) Non-prime numbers: 4, 6, 8, 9, 10, 12, 14, 15, 16, 18, (10 in total)

Probability = # favourable outcomes / # of total outcomes

= 10/20 or 1/2