5
Find the inverse of 4
2 3
a. 1st entry=3/2, 2nd entry=-5/2,
3rd entry=-1, 4th entry=2
b. 1st entry=1/2, 2nd entry=-5/3,
3rd entry=4, 4th entry=6
c. 1st entry=3/2, 2nd entry=5/2,
3rd entry=1, 4th entry=3
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