Discussion Forum



1)

There are four prime numbers written in ascending order. The product of the first three is 385 and that of the last three is 1001. The last number is :


A) 11

B) 13

C) 17

D) 19

Answer:

Option B

Explanation:

Let the given prime numbers be a, b, c, d. Then, abc = 385 and bcd = 1001.

(abc)/(bcd)=385/1001

<=> a/d = 5/13.

so a = 5, d = 13