IKMC 2015 - Grades 11-12 - Self-study Question 18

Question 18

Bibi rolls a fair die labelled 1,2,3,4,5,6. Tina independently rolls a fair die labelled 2,2,2,5,5,5. Tina wins only if her number is greater. What is her winning probability?

$1/3$
$7/18$
$5/12$
$1/2$
$11/18$