Q5 of 16 Page 5

Can the number 6n, n being a natural number end with the digit 5? Give reasons.

Given number is 6n, where n is the natural number ending with digit 5.


So the number must be divisible by 5, if take first natural number ending with 5.


6n = 6 × 5


= 30


So 6 multiplying by any multiple of 5 has last digit zero


So the last digit of 6n can never be 5.


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