Q:

Which of the following interchanges of numbers and mathematical signs would make the given equation correct?
 729 × 81 ÷ 20 + 16 − 6 = 50

• 1
  6 and 20, × and ÷
• 2
  20 and 50, + and −
• 3
  16 and 50, × and +
• 4
  16 and 20, + and ÷