Let A=[\table a , b ; c , d] and B=[\table \alpha ; \beta] \neq[\table 0 ; 0], such that A B=B and a+d=2021, then the value of a d-b c is equal to [17 Mar 2021 Shift 2]

JEE Main 17 March 2021 Shift 2 Solved Paper

Section: Mathematics

Question : 87 of 90

Marks: +1, -0

Let A=[

a	b
c	d

] and B=[

]≠[

], such that AB=B and a+d=2021, then the value of ad−bc is equal to

[17 Mar 2021 Shift 2]

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(a−1)	b
c	(d−1)