The MATH MATH COMBINATIONS App was designed with the aim of assisting you in calculating and checking results. This application does not intend to teach what is EXCHANGE (Anagram), or ARRANGEMENT and neither COMBINATION. Carefully analyze the summary presented on the opening screen, go back and check again, study and try to understand better from your teacher’s definitions and class notes. If you need to use the internet, I suggest the Escola digital portal (source of the opening picture) or the Genial Math channel (https://youtu.be/3RaTJOZL6MA). If you are confident, proceed to the calculations and provide the data of your problem or question. Good studies and don't forget to share knowledge and recommend this App to your friends.