MEANS +, @ means -9 # 3 @ 2 = 10→ 9 + 3 - 2→ 12 - 2 = 1011 # 4 @ 1 = 14→ 11 + 4 - 1→ 15 - 1 = 14Similarly,9 # 6 @ 9→ 9 + 6 - 9→ 15 - 9→ 6Thus, ‘6’ is the correct ANSWER.