Question 1173254
.


Part (a) is just answered.


Part (b) is just answered.


Part  (c)  breaks down in two parts,  whether the repeating is allowed or not.



Do not try to pack many questions into one post ---- it  ALWAYS  works  AGAINST  you.


And against the rules of this forum,  that require 


<H3>&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;One and ONLY ONE question per post.</H3>