human
Count of strings that can be formed using a , b and c under given constraints | n is total number of characters . bCount and cCount are counts of ' b ' and ' c ' respectively ..
Base cases.
Three cases , we choose , a or b or c In all three cases n decreases by 1..
Driver code.
Total number of characters"
Solution in Python:

What is a code to count of strings that can be formed using a , b and c under given constraints and the other steps required?
assistant
#Here is code to count of strings that can be formed using a , b and c under given constraints and the other steps required.
 def countStr ( n , bCount , cCount ) :
	if ( bCount < 0 or cCount < 0 ) :
		return 0
	if ( n == 0 ) :
		return 1
	if ( bCount == 0 and cCount == 0 ) :
		return 1
	res = countStr ( n - 1 , bCount , cCount )
	res += countStr ( n - 1 , bCount - 1 , cCount )
	res += countStr ( n - 1 , bCount , cCount - 1 )
	return res
if __name__ == " _ _ main _ _ " :
	n = 3
	print ( countStr ( n , 1 , 2 ) )