SEAMO 2027 - Paper B - SET 05 - Self-study Question 12

In a new operation, 2 ◐ 4 = 8, 4 ◐ 3 = 11, and 8 ◐ 7 = 23. Find 13 ◐ 9.

Use the intended simple arithmetic rule that is the same in all three examples. Examples alone do not uniquely specify an arbitrary operation.