Correct Answer: ÷ and +

Solution : Given:
31 ÷ 48 × 7 – 322 + 23 = 353

Replace the given symbols in the options one by one with the original symbols in the given equation.
First option: ÷ and –
= 31 – 48 × 7 ÷ 322 + 23
= 31 – 1.043 + 23
= 52.96 ≠ 353
Second option: – and ×
= 31 ÷ 48 – 7 × 322 + 23
= 0.65 – 2254 + 23
= –2230.35 ≠​​​​​​​ 353
Third option: × and +
= 31 ÷ 48 + 7 – 322 × 23
= 0.65 + 7 – 7406
= –7398.35 ≠ 353
Fourth option: ÷ and +
= 31 + 48 × 7 – 322 ÷ 23
= 31 + 336 – 14
= 353

Here, only the fourth option satisfies the R.H.S. of the given equation. Hence, the fourth option is correct.