Q:

By interchanging the given two signs and numbers which of the following equation will be correct?
 + and –, 7 and 6

• 1
  4 × 7 + 6 – 3 ÷ 1 = 20
• 2
  8 × 7 + 5 ÷ 1 – 6 = 17
• 3
  7 – 6 × 3 + 4 ÷ 1 = 8
• 4
  7 × 2 – 6 + 4 ÷ 2 = 13