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Arshbir Singh from Lotus valley International School, Gurgaon
Subject :IMO    Class : Class 7

The largest 10-digit number formed by using all odd digits such that no digit occurs more than thrice is ______.

A9,99,77,75,553
B9,97,75,53,311
C9,99,77,75,531
D99,99,77,75,531


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