Which two numbers should be interchanged to make the given equation correct?
(86 ÷ 43) + (66 ÷ 33) × 2 + 72 – 6 × 4 = 177
(NOTE: Numbers must be interchanged and not the constituent digits e.g. if 2 and 3 are to be interchanged in the equation 43 × 3 + 4 ÷ 2, then interchanged equation is 43 × 2 + 4 ÷ 3)
1
43 and 2
2
2 and 72
3
2 and 4
4
2 and 6