Question

An unbiased die is rolled twice what is probability that the sum of the numbers on the two rolls of the die is a prime number

Answer 1

Answer:

Prime Numbers on dice = 2 , 3 & 5

i.e Total 3 Prime No.

P ( E ) in single Rolling = 3 / 6

As , Total 6 Numbers are present on Dice .

Therefore ;

A/ Q ,

Probability of Sum of the Prime numbers on the two rolls of the die : -

=> 3 / 6 + 3 / 6

=> 1