Combine Prediction
Made easy to understand.. Derp !
Without Jewels
4 get 1
You will need to combine
4 monsters of same rank to get a monster of higher rank without using jewels.
Example:
4 Rare monsters allows for 3 combines => Results in getting 1 legend monsters.
If your lucky you will get it in less than 3 combines. If unlucky...
With Jewels
3 get 1
You will need
3 instead of 4 monsters.
3 ancient monsters allows for 2 combines => Results in 1 chaos