You attempt a one-way ANOVA test and you have 3 levels for your factor where the null hypothesis states that the population means corresponding to...

You attempt a one-way ANOVA test and you have 3 levels for your factor where the null hypothesis states that the population means corresponding to these 3 levels are equal. The alternative hypothesis states that there are two means that are significantly different. The conclusion is to retain the alternative hypothesis, so two means are significantly different. However, you don't know exactly which two means. Can you determine the two?