Correct Answer - Option 1 : 5

**Calculation **

From the option

So let first prime no. is 5

then another prime no.s are 7, 11, 13

Product of 1st 3 prime no. = 385

⇒ 5 × 7 × 11 = 385

satisfy the condition

Product of last 3 no. = 1001

⇒ 7 × 11 × 13 = 1001

This condition is also satisfied

**∴ The first prime no. is 5**