If 84 ⊕ 72 = 45 ; 63 ⊕ 41 = 33 ; 74 ⊕ 52 = 33 ; then 94 ⊕ 82 = ?
2013
If 84 ⊕ 72 = 45 ; 63 ⊕ 41 = 33 ; 74 ⊕ 52 = 33 ; then 94 ⊕ 82 = ?
- A.
45
- B.
59
- C.
56
- D.
65
Attempted by 20 students.
Show answer & explanation
Correct answer: C
Pattern: for each two-digit number, subtract the units digit from the tens digit, then write the two results side by side. 84 -> 8-4 = 4 ; 72 -> 7-2 = 5 => 45. 63 -> 6-3 = 3 ; 41 -> 4-1 = 3 => 33. 74 -> 7-4 = 3 ; 52 -> 5-2 = 3 => 33. Apply the same rule: 94 -> 9-4 = 5 ; 82 -> 8-2 = 6 => 56.