This Secret recruit pool contains 15 officers, and here are the probabilities of what you can get：
Any single fragment, 3.68%；
Any 3 fragments, 2.21%；
Any 5 fragments, 0.74%；
Any complete officer, 0.74%；


Recruit a total of 100 times guarantees a complete officers ( All 15 officers in the pool have the same obtain chance)