human
Probability of choosing a random pair with maximum sum in an array | Function to get max first and second.
If current element is smaller than first , then update both first and second.
If arr [ i ] is in between first and second then update second.
cnt1 += 1 frequency of first maximum.
cnt2 += 1 frequency of second maximum.
Returns probability of choosing a pair with maximum sum ..
Driver Code"
Solution in Python:
 ... What is a code to probability of choosing a random pair with maximum sum in an array and the other steps required?
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#Here is code to probability of choosing a random pair with maximum sum in an array and the other steps required.
 def countMaxSumPairs ( a , n ) :
	first = 0
	second = 0
	for i in range ( n ) :
		if ( a [ i ] > first ) :
			second = first
			first = a [ i ]
		elif ( a [ i ] > second and a [ i ] != first ) :
			second = a [ i ]
	cnt1 = 0
	cnt2 = 0
	for i in range ( n ) :
		if ( a [ i ] == first ) :
		if ( a [ i ] == second ) :
	if ( cnt1 == 1 ) :
		return cnt2
	if ( cnt1 > 1 ) :
		return cnt1 * ( cnt1 - 1 ) / 2
def findMaxSumProbability ( a , n ) :
	total = n * ( n - 1 ) / 2
	max_sum_pairs = countMaxSumPairs ( a , n )
	return max_sum_pairs / total
if __name__ == " _ _ main _ _ " :
	a = [ 1 , 2 , 2 , 3 ]
	n = len ( a )
	print ( findMaxSumProbability ( a , n ) )