#1**+1 **

We split it up into two cases, one where the first number is odd and one where the first number is even.

ODD: We have 3 choices for the first, 2 choices for the second, 3 choices for the third, and so on, giving us a number of 108 possible ways.

EVEN: We have 2 choices for the first, 3 choices for the second, 2 choices for the third, and so on, giving us a number of 72 possible ways.

108+72 = **180 possible combinations**.

ThatOnePerson Oct 29, 2019