Step-by-step explanation: the pattern is add 2 then minus one. But then the 2 continues to 3 4 5 and so on. So u add 5 to 8 which gives 13 then minus 1 again to get 12
from 2 it goes up by 2 to get 4 then subtracts by 1 to get 3, then goes up by 3 to get 6 then subtract one to get 5, then it goes up by 4 to get 9 then goes down by 1 to get 8.
Following the pattern, go up by 5 to get 13 then subtract 1 to get 12
