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(A) 9000
(B) 9400
(C) 9600
(D) 9800
Correct Answer - Option(C)
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Explanation:

Greatest number of 4-digits is 9999.
L.C.M. of 15, 25, 40 and 75 is 600.
On dividing 9999 by 600, the remainder is 399.
∴ Required number (9999 - 399) = 9600. 

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