Correct Answer: ×, +, −, =

Solution : Given:
30 * 4 * 2 * 1 * 121

Let's check the options –
First option: ×, +, −, =
⇒ 30 × 4 + 2 − 1 = 121
Solving the L.H.S. of the given equation –
= 30 × 4 + 2 − 1
= 120 + 2 − 1
= 121
Second option: ×, −, ÷, =
⇒ 30 × 4 − 2 ÷ 1 = 121
Solving the L.H.S. of the given equation –
= 30 × 4 − 2 ÷ 1
= 30 × 4 − 2
= 120 − 2
= 118 ≠ 121
Third option: ×, −, +, =
⇒ 30 × 4 − 2 + 1 = 121
Solving the L.H.S. of the given equation –
= 30 × 4 − 2 + 1
= 120 − 2 + 1
= 119 ≠ 121
Fourth option: ÷, +, −, =
⇒ 30 ÷ 4 + 2 − 1 = 121
Solving the L.H.S. of the given equation –
= 30 ÷ 4 + 2 − 1
= 7.5 + 2 − 1
= 8.5 ≠ 121

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