Talk:Expedition/@comment-98.248.101.102-20140421181425/@comment-124.33.173.3-20140421182139

If an Expedition has two rewards, you have a 50% chance to get the left one. You have a 100% chance to get the one on the right if you achieve Great Success, otherwise it's 0%.

BTW: Learn to read, it's right there in the description.