DIFFERENCE BETWEEN A NUMBER OF AND THE NUMBER OF

This video is about the difference between 'A NUMBER OF & THE NUMBER OF".
....................................................................................................
Please visit my vlog channel of which link has been given below:

a number of,the number of,difference between a number of and the number of,what is a number of,what is the number of,a number of grammar,a number of english grammar,the number of grammar,the number of english grammar,