Ex 1.2 , 5
Check whether 6n can end with the digit 0 for any natural number n.
Let us take the example of a number which ends with the digit 0
So, 10 = 2 5
100 = 2 2 5 5
Here we note that numbers ending with 0 has both 2 and 5 as their prime factors
Whereas 6n = (2 3) n
Does not have 5 as a prime factor.
So, it does not end with zero.
Therefore, 6n cannot end with zero for any natural number n

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Davneet Singh

Davneet Singh is a graduate from Indian Institute of Technology, Kanpur. He has been teaching from the past 12 years. He provides courses for Maths and Science at Teachoo.