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If A = [(1,2),(3,4)], adj A = [(4,a),(-...

If A = `[(1,2),(3,4)]`, adj A = `[(4,a),(-3,b)]` then value of a and b are :
(a) `a=-2,b=1`
(b) `a=2,b=4`
(c) `a=2,b=-1`
(d) `a=1,b=-2`

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