Can the number 6n is being a natural number end with 5 digit number
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Prime factorisation of 
= 
For the numbers to end with 5 they should be a multiple of 5 or should have 5 in its prime factorization.
Therefore, it cannot end with 5.
For the numbers to end with 5 they should be a multiple of 5 or should have 5 in its prime factorization.
Therefore, it cannot end with 5.
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