Given A=∣∣
∣∣ab2cde2flm2n∣∣
∣∣,B=∣∣
∣∣f2de2n4l2mc2ab∣∣
∣∣
A=∣∣
∣∣ab2cde2flm2n∣∣
∣∣=2∣∣
∣∣abcdeflmn∣∣
∣∣
B=∣∣
∣∣f2de2n4l2mc2ab∣∣
∣∣
=4∣∣
∣∣fdenlmcab∣∣
∣∣
interchanging columns gives
=4∣∣
∣∣deflmnabc∣∣
∣∣
interchanging rows gives
=4∣∣
∣∣abcdeflmn∣∣
∣∣
∴BA=2