1. ## Principal minors

hi all,

this looks obvious but i am not getting it. so L.P.Ms are 1,3,2. i started diagonally from the left :
i got 1, 3...and then for the last i got :

1(16) + 3( 1) + 5(3) = 14+3+15

this isn't equal to 2!! what am i doing wrong?

thanks