Correct Answer: 2 and 3

Solution : Given:
8 × 2 + 6 ÷ 3 – 7

Replace the given numbers in the options one by one with the original numbers in the given equation.
First option: 6 and 7
8 × 2 + 6 ÷ 3 – 7
= 8 × 2 + 7 ÷ 3 – 6
= 16 + 2.33 – 6
= 12.33 ≠ 20
Second option: 8 and 7
8 × 2 + 6 ÷ 3 – 7
= 7 × 2 + 6 ÷ 3 – 8
= 7 × 2 + 2 – 8
= 8 ≠ 20
Third option: 2 and 6
8 × 2 + 6 ÷ 3 – 7
= 8 × 6 + 2 ÷ 3 – 7
= 8 × 6 + 0.66 – 7
= 41.66 ≠ 20
Fourth option: 2 and 3
8 × 2 + 6 ÷ 3 – 7
= 8 × 3 + 6 ÷ 2 – 7
= 8 × 3 + 3 – 7
= 20

So, the fourth option satisfies the equation. Hence, the fourth option is correct.