Question

show that 21n cannot end with the digits 0,2,4,6,8 for any natural number n

Answer 1

$in \: 21n \: if \: n = 2 \\ \\ 21 \times 2 = 42$


42 and with 2.


so 21n can end with a number song 0 2 4 6 8.



show the given question is wrong