Question

Q.1 If A = { x:x3= 1 } and B = { x: x2 = 1 }
then number of elements in A

Answer 1

Step-by-step explanation:

A={xϵz:2(x+2)(x2−5x+6)=1}

2(x+2)(x2−5x+6)=20⇒x=−2,2,3

A={−2,2,3}

B={xϵZ:−3<2x−1<9}

B={0,1,2,3,4}

A × B has is 15 elements so number of subsets of A × B is 215.