Number system: The Last Digit Concept

Last digit concept is one of the few important concepts that has been put to test. It deals with following two fundamentals:

• Division by 10 to know the unit place of expression. In this case it is the extension of remainder theorem.
• Representation of any number in form of 4n + x . This is used when a number is raised to some huge power is given.

See this video to understand the concept in detail:

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