text: Count triplets from a given range having sum of two numbers of a triplet equal to the third number | Function to find the number of triplets from the range [ L , R ] having sum of two numbers from the triplet equal to the third number ; Stores the total number of triplets ; Find the difference of the range ; Case 1 : If triplets can 't  be formed, then return 0 ; Otherwise ; Update the total number of triplets ; Return the count ; Driver Code
code: def totalCombination ( L , R ) : NEW_LINE INDENT count = 0 NEW_LINE K = R - L NEW_LINE if ( K < L ) : NEW_LINE INDENT return 0 NEW_LINE DEDENT ans = K - L NEW_LINE count = ( ( ans + 1 ) * ( ans + 2 ) ) // 2 NEW_LINE return count NEW_LINE DEDENT if __name__ == ' _ _ main _ _ ' : NEW_LINE INDENT L , R = 2 , 6 NEW_LINE print ( totalCombination ( L , R ) ) NEW_LINE DEDENT