P5_A  	You can replace them with the single if statement:
			if (n >= 2)
	  		 	n = (n >=7 ?  n-7 : 3*n+1);
	  		 		 
P5_B	i. 	They're not playing each other.
	ii. 	One's a nickel, the other's a quarter (and yes, one is not a nickel).
		
P5_C	When a reference to an array is made, the index must be >= 0 and < the size of
	the array.  Java always checks to see if the index in a reference to a particular
	array lies in the valid range of indexes for that array.  If the index is invalid,
	Java throws an exception called ArrayIndexOutOfBoundsException to alert the programmer.