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A six-digit number is formed by repeating a three-digit number; for example, 256256 or 678678 etc. Any number of this form is always exactly divisible by:

Options:
A .  7 only
B .  13 only
C .  11 only
D .  1001
E .  None of these
Answer: Option D
 -  256256 = 256 x 1001; 678678 = 678 x 1001, etc.
So, any number of this form is divisible by 1001

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