Number System(Lecture-10) Rules of divisibility

Divisibility rules are very important from exam point of view. Questions are asked in almost all competition exams. This rules also help in calculation and in option elimination in exams that boost the speed of a student.
Rule of 2,4,8,16,32,64
Rule of 5,25,125,625
Rule of 3,9
Rule of 11
Rule of 7
Rule of 13
Rule of 27
Rule of 37
Rule of 9,99,999,9999,99999
rule of 11,101,1001,10001
Rule of composite numbers are discussed

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