Here is a code segment: int i,j;

 for( i=start; i<=end; i++) { for( j=first; j 
 printf("%6d", i*6+j); } 
 
 printf(" "); } 
 
If the output of the code is
 
1 2 3
 
7 8 9
 
13 14 15
 
19 20 21
 
25 26 27
 
31 32 33
 
what are the values of the follow:
 
a) start
 
b) end
 
c) first
 
d) last