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The four prime numbers are written in ascending order. The product of first three is 385 and the product of last three is 1001. What is the first prime number?
1. 5
2. 7
3. 11
4. 17

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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

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