Q:

By interchanging the given two signs and numbers which of the following equation will be not correct?
 ÷ and ×, 1 and 3

• 1
  6 ÷ 3 – 1 + 4 × 2 = 5
• 2
  4 × 3 – 1 + 8 ÷ 2 = 9
• 3
  5 – 8 × 3 + 9 ÷ 1 = 24
• 4
  6 + 4 – 9 × 3 ÷ 1 = –17