1.  Which of the following numbers is divisible by each one of 3, 7, 9 and 11 ?

A. 639
B. 2079
C. 3791
D. 37911
E. None of these

Answer: Option B

Explanation:

639 is not divisible by 7

2079 is divisible by each of 3, 7, 9, 11.