Correct Answer: + and =

Solution : Given:
6 = 9 ÷ 3 – 2 + 7

Interchange the signs according to options.
First option: = and –
6 – 9 ÷ 3 = 2 + 7
6 – 3 = 9
3 ≠ 9
Second option: + and ÷
6 = 9 + 3 – 2 ÷ 7
= 9 + 3 – 0.285
6 ≠ 11.715
Third option: – and +
6 = 9 ÷ 3 + 2 – 7
= 3 + 2 – 7
6 ≠ –2
Fourth option: + and =
6 + 9 ÷ 3 – 2 = 7
6 + 3 – 2 = 7
7 = 7.

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