Priyesh, your solution seems to be correct, But my doubt is that total number of numbers are coming out to be 15625 and ur answer is 1405, Can there be such a large difference?????? Because only a few cases are neglected w.r.t to total numbers in this question. Only those cases are neglected which have every number only once. SO are there as many cases as 14220????? I don't think so.
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