Mathematics for IGCSE & O level - Probability (Section 3 - No. 50)
What are the odds against rolling a 6 on a standard six-sided die?
1:6
5:1
1:5
6:1
Paliwanag
Odds against are the ratio of unfavorable outcomes to favorable outcomes. There is 1 favorable outcome (rolling a 6), and 5 unfavorable outcomes (rolling anything else). This gives us 5:1