Question

One number is chosen at random from the numbers 1 to 21.Find the probability that may be a prime number.

Answer 1

hi

aim :One number is chosen at random from the numbers 1 to 21.Find the probability that may be a prime number.

One number is chosen at random from the numbers 1 to 21

so numbers from 1 to 21 = 21

now,

we have to .Find the probability that may be a prime number.

prime numbers form 1 to 21

=> 2, 3, 5, 7, 11, 13, 17, 19

= 8 numbers

now problaity = no .of prime numbers / total numbers

                       = 8/21
hope it hellps u

:)

Answer 2

Total Outcomes (T.O.)=21.
Sample space =Prime numbers fro 1 to 21 are 2,3,5,7,11,13,17,19.
Favourable Outcomes(F.O.)=8.
Probability that may be a number is prime number =F.O./T.O.=8/21.

HOPE IT HELPS U..