Question

Suppose that the die is rolled twice, rather than once. find the probability of rolling an even number on at least one die. find p(aon first toss or a on second toss)

Answer 1

We know P = 1/2

X~B(2, 0.5)
n = 1

2C1 from pascal triangle = 2

P(X=0.5)= 2C1 x 0.5 x 0.5

= 0.5
= 50%