0 votes 0 votes How it solve this ? Set Theory & Algebra engineering-mathematics test-series matrix + – Kalpataru Bose asked Dec 26, 2017 Kalpataru Bose 329 views answer comment Share Follow See 1 comment See all 1 1 comment reply Warrior_19 commented Dec 12, 2018 reply Follow Share $A^2=I$ is the involutary matrix. Take A as identity matrix. Trace is the sum of all Principal diagonal elements. so 1+1+1 = 3 which is ODD 0 votes 0 votes Please log in or register to add a comment.