15 |2134|
15 |4−3−12|
15 |2−1−34|
15 |4312|
Correct answer is B
N = [2 3]
N-1 = adjN|N|
adj N = |4−3−12|
|N| = (2 x4) - (1 x 3)
= 8 - 3
=5
N-1 = 15 |4−3−12|
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