Correct Answer: +, ×, <, and ×

Solution : Given:
9 ? 3 ? 6 ? 8 ? 4

Let's check the options –
First option: –, ×, =, and ×
⇒ 9 – 3 × 6 = 8 × 4
L.H.S. = 9 – 3 × 6
= 9 – 18 = –9
R.H.S. = 8 × 4 = 32
L.H.S. ≠ R.H.S.
Second option: ÷, +, >, and +;
⇒ 9 ÷ 3 + 6 > 8 + 4
⇒ 3 + 6 > 12
⇒ 9 is not greater than 12
L.H.S. is not greater than R.H.S.
Third option: +, ×, <, and ×;
⇒ 9 + 3 × 6 < 8 × 4
⇒ 9 + 18 < 32
⇒ 27 < 32
L.H.S. is smaller than R.H.S.
Fourth option: ×, +, <, and ×;
⇒ 9 × 3 + 6 < 8 × 4
⇒ 27 + 6 < 32
⇒ 33 is not smaller than 32
L.H.S. is not smaller than R.H.S.

So, only the third option satisfies the equation. Hence, the third option is correct.