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Class 8-9-10, JEE & NEET
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Show that any number of the form 4, n ∈ N can never end with the digit 0.
If 4 ends with 0, then it must have 5 as a factor.
But we know the only prime factor of 4 is 2.
Also we know from the fundamental theorem of arithmetic that prime factorisation of each number is unique.
Hence, 4 can never end with the digit 0.