Combination of encryption and decryption for secure communication is an application. Here, the authors are using permutation and substitution technique to make the people’s data more secure.

Order matters because a permutation produces the number of digit entryways rather than a combination.

Here are 8 tips to help you understand and master permutations and combinations for CAT; Understand the Basics Make sure you have a strong understanding of fundamental concepts. Permutations deal ...

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