Correct Answer: 1 and 4

Solution : Given:
8 × 1 – 9 ÷ 3 + 4 = 30

Replace the given numbers according to the options one by one with the original numbers in the given equation.
First option: 4 and 3
Solving the L.H.S. of the equation –
= 8 × 1 – 9 ÷ 4 + 3
= 8 × 1 – 2.25 + 3
= 8 – 2.25 + 3
= 8.75 ≠ 30
Second option: 1 and 4
Solving the L.H.S. of the equation –
= 8 × 4 – 9 ÷ 3 + 1
= 8 × 4 – 3 + 1
= 32 – 3 + 1
= 30 = R.H.S.
Third option: 3 and 9
Solving the L.H.S. of the equation –
= 8 × 1 – 3 ÷ 9 + 4
= 8 × 1 – 0.34 + 4
= 8 – 0.34 + 4
= 11.67 ≠ ​​​​​​​30​​​​​​​
Fourth option: 8 and 4
Solving the L.H.S. of the equation –
= 4 × 1 – 9 ÷ 3 + 8
= 4 × 1 – 3 + 8
= 4 – 3 + 8
= 9 ≠​​​​​​​ ​​​​​​​30

So, only the second option satisfies the R.H.S. of the given equation. Hence, the second option is correct.