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The greatest number of four digits which is divisible by each one of the numbers $12$, $18$, $21$ & $28$, is :

1. $9848$
2. $9864$
3. $9828$
4. $9636$

The greatest 4 digits number is 9999
The LCM of 12, 18, 21, 28 is 252
On dividing 9999 by 252 the remainder comes out to 171
Required number = 9999 - 171 = 9828

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