If (R={(1,2),(2,3),(1,3),(3,3)}), which pair is needed for transitivity based on ((1,2)) and ((2,3))?

Correct answer: ((1,3))

Step 1: Transitivity needs ((a,c)) from ((a,b)) and ((b,c)). Step 2: From ((1,2)) and ((2,3)), we get ((1,3)). Step 3: For transitivity, take the first element of the first pair and the second element of the second pair.