Question

give the answer of this question

Answer 1

let n be divisible by 3

then next numbers to n which are divisible by 3

= n+3. ,. n+6 , n+9 ...

therefore n+2 and n+4 are not divisible by 3



if we think n+2 is divisible by 3
then it's previous numbers divisible by 3 are

n+2-3 = n-1 , n+2-6 =n-4 ....

and next numbers divisible by 3 are
n +2 +3 = n+5 , n+2+6 = n+8


so , n or n+4 are not divisible by 3 if n+2 is ...


in the same way we can show if n+4 is divisible by 3 then others two not divisible by 3