Correct Answer: × and ÷,7 and 5

Solution : Given:
7 – 2 × 1 ÷ 3 + 5 = 6

Replace the given symbols and numbers according to the options one by one with the original symbols and numbers in the given equation.
First option: × and ÷, 7 and 5
Solving the L.H.S. of the equation –
= 5 – 2 ÷ 1 × 3 + 7
= 5 – 6 + 7
= 6 = R.H.S.
Second option: × and ÷, 2 and 7
Solving the L.H.S. of the equation –
= 2 – 7 ÷ 1 × 3 + 5
= 2 – 21 + 5
= –14 ≠ 6
Third option: + and –, 7 and 5
Solving the L.H.S. of the equation –
= 5 + 2 × 1 ÷ 3 – 7
= 5 + 2 × 0.33 – 7
= 5 + 0.66 – 7
= –1.34 ≠ 6
Fourth option: × and –, 5 and 3
Solving the L.H.S. of the equation –
= 7 × 2 – 1 ÷ 5 + 3
= 14 – 0.2 + 3
= 16.8 ≠ 6

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