If A=⎡⎣10121⎤⎦ and B=[bij] is a matrix such that An−A2+I=B (where n∈N). If 2(b21+b22)=7 then, n is
Let n(A−B)=25+x, n(B−A)=2x and n(A∩B)=2x. If n(A)=2(n(B)) then 'x' is