Consecutive means that numbers follow each other. Think about the link between two numbers that follow each other, for example : 4 and 5
to get 5 from 4, you need to do +1
there. to write consecutive numbers using n, you need to do
n, n + 1
then you need the number following n + 1
once again to get a new number, do (n + 1) + 1
so the 3 numbers are :
n
n + 1
n + 2