A number is randomly picked from following list 2, 3, 4, 5, 6, 7, 8, 9 and so on till 18. What is t

M4maths Previous Puzzles

28 Apr 2017 Probability

A number is randomly picked from following list 2, 3, 4, 5, 6, 7, 8, 9 and so on till 18.
What is the probability that its a prime number?

OPtion

1) 7/17
2) 7/18
3) 6/17
4) 6/18
5) 8/17
6) 8/18
7) 7/16
8) 8/16
9) 6/16
10) None of these

Solution

Count of total number betweeen 2 to 18 = 17

List of Prime numbers between 2 to 18:
2, 3, 5, 7, 11, 13, 17
Count of (2, 3, 5, 7, 11, 13, 17) = 7

Probability of selecting prime number from numbers between 2 to 18 = 7/17

Correct Option: 1 Best Solution (15)

G.S.Kantharao   7 years AGO

The numbers arre 2,3,4,5,....18
Total no.of outcomes=17
Prime Numbers upto 18 is= 2,3,5,7,11,13,17.
No. of required outcomes= 7
P(E)= 7/17
So the Right option is 1

Like? Yes (5) | No   

Devendra Marghade   7 years AGO

2, 3, 4, 5, 6, 7, 8, 9, 10, 11, 12, 13, 14, 15, 16, 17, 18 Total=17 numbers
Prime numbers are 2, 3, 5, 7, 11, 13, 17, total 7
So required probability= 7/17
Option 1)

Like? Yes | No   

Azim Uddin Siddiqui   7 years AGO

Total Nos:17
prime nos till 18 are 2,3,5,7,11,13,17 i.e. 7 prime nos.
so probability= 7/17

Like? Yes | No   

Mukund Manohar   7 years AGO

Total count of numbers, n(S) = 17
Prime numbers in the given range are 2,3,5,7,11,13 and 17
So, total count of prime numbers in the given range, n(E) = 7
Required Probability = n(E)/n(S) = 7/17

Like? Yes | No   

g lokesh   7 years AGO

there are 17 numbers and in that 7 are prime numbers..
probability=7/17

Like? Yes | No   

Haritha Mummidivarapu   7 years AGO

prime numbers in 2 to 18 are 2, 3, 5, 7,11,13,17
total prime numbers : 7
total numbers : 17

therefore, 7/17

Like? Yes | No   

jyothi chhabria   7 years AGO

total numbers from 2 to 18 is 17
prime numbers from 2 to 18 are 7 that are 2,3,5,7,11,13,17
therefore total probality is 7/17

Like? Yes | No   

Bupathikavya   7 years AGO

2 3 5 7 11 13 17 are the prime from 2 to 18
prime count = 7
total count = 17
so probability its a prime = 7/17

Like? Yes | No   

Vittesh   7 years AGO

Total no upto 18 = 17

total no of prime no = 2,3,5,7,11,13, 17 = 7

p= 7/17

Like? Yes | No   

Jyotasana   7 years AGO

Prime nos. Are 2,3,5,7,11,13,17=7 Numbers
total nos. =17
so,7/17

Like? Yes | No   

ganesh chemanchula   7 years AGO

2,3,4....18 total numbers 17
Primen umbers 2,3,5,7,11,13,17 total 7
probability is 7/17

Like? Yes | No   

vaibhav patil   7 years AGO

Total no of Nos between 2 and 18 = 17
Total primenos = 7
{2,3,5,7,11,13,17}

P(Prime)= 7/17

Like? Yes | No   

Ayush Gupta   7 years AGO

prime no lying in this range-2 3 5 7 11 13 17
total prime no=7
total number=17
probability=7/17

Like? Yes | No   

ganesh babu   7 years AGO

total 17
prime number 2,3,5,7,11,13,17
total 7
p=7/17

Like? Yes | No   

MOHIT KUMAR   7 years AGO

because prime number is devisable by itself
so the prime number between 2to 18are these
2,3,5,7,11,13,17

Like? Yes | No