By interchanging which two numbers (not digits) the equation will be correct?
5 + 7 × 4 – 8 ÷ 2 = 17

Correct option is B

Given equation: 5 + 7 × 4 – 8 ÷ 2 = 17
Option a: Interchange 5 and 4
New equation: 4 + 7 × 5 – 8 ÷ 2
Following the order of operations (multiplication and division first):
1. 7 × 5 = 35
2. 8 ÷ 2 = 4
Now substitute back: 4 + 35 – 4 = 35
This does not equal 17, so option (a) is incorrect.
Option b: Interchange 4 and 2
New equation: 5 + 7 × 2 – 8 ÷ 4
1. 7 × 2 = 14
2. 8 ÷ 4 = 2
Now substitute back: 5 + 14 – 2 = 17
This equals 17, so option b is correct.
Verification of Remaining Options
Since we have already found the correct answer, further verification of other options is unnecessary. However, if we tested each, they would not equal 17.
Answer:
The correct answer is: 4 and 2