Question:
Consider the number 5n where n is a natural number. Check whether there is any value of n for which 5n ends with the digit zero.
Answer:
If any number ends with the digit 0, it should be divisible by 10 or in other words,
it will also be divisible by 2 and 5 as 10 = 2 * 5
It can be observed that 2 is not in the prime factorisation of 5n
Hence, for any value of n, 5n will not be divisible by 2.
Therefore, 5n cannot end with the digit 0 for any natural number n.
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