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
function totalCombination ( L , R ) { let count = 0 ; let K = R - L ; if ( K < L ) return 0 ; let ans = K - L ; count = ( ( ans + 1 ) * ( ans + 2 ) ) / 2 ; return count ; } let L = 2 , R = 6 ; document . write ( totalCombination ( L , R ) ) ;