Question

Cards marked with numbers 10 to 29 are placed in a box and mixed throughly. One card is draw at random from the box. Find the probability of getting:
i] An odd number
ii] A number which is prime less than 20.​

Answer 1

Step-by-step explanation:

ANSWER

1)Number on cards are 2 to 101

Even number are 2,4,6,..,100=50

Probability that it's an even number =50/100=1/2

2)Numbers less than 14 are 2,3,4,5,6,7,8,9,10,11,12,13=12

Probability=12/100=3/25

3) Perfect square are=4,9,16,25,36,49,64,81,100=9

Probability=9/100

4) Prime number less than 20 are 2,3,5,7,11,13,17,19=8

Probability=8/100=2/25

Answer 2

$probability \: = \frac{number \: of \: favourable \: outcomes}{total \: number \: of \: outcomes}$

i) Odd numbers from 10-29= 11,13,15,17,19,21,23,25, 27, 29

P(odd number)= 10/20 = 1/2

ii) Prime numbers less than 20= 11, 13, 17, 19

P(prime number less than 20)= 4/20= 1/5

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