Correct Answer: ×, +, ÷, −

Solution : Given:
5 * 15 * 320 * 2 * 45 = 190

Let's check the options –
First option: +, ÷, ×, −
⇒ 5 + 15 ÷ 320 × 2 − 45 = 190
Solving the L.H.S. of the given equation –
= 5 + 15 ÷ 320 × 2 − 45
= 5 + 0.0468 × 2 − 45
= 5 + 0.0936 − 45
= −39.9064 ≠ 190
Second option: ×, +, ÷, −
⇒ 5 × 15 + 320 ÷ 2 − 45 = 190
Solving the L.H.S. of the given equation –
= 5 × 15 + 320 ÷ 2 − 45
= 5 × 15 + 160 − 45
= 75 + 160 − 45
= 190
Third option: +, ×, ÷, −
⇒ 5 + 15 × 320 ÷ 2 − 45 = 190
Solving the L.H.S. of the given equation –
= 5 + 15 × 320 ÷ 2 − 45
= 5 + 15 × 160 − 45
= 5 + 2400 − 45
= 2360 ≠ 190
Fourth option: ×, ÷, −, +
⇒ 5 × 15 ÷ 320 − 2 + 45 = 190
Solving the L.H.S. of the given equation –
= 5 × 15 ÷ 320 − 2 + 45
= 5 × 0.0468 − 2 + 45
= 0.234 − 2 + 45
= 43.234 ≠ 190

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