Question

bro ans fr this sum
then find n(a×b​

Answer 1

n( A ) = 0 , this is becuase there is no such real number whose square is - 1...

n ( B ) = { 1 , 2 , 3 , 4 , 5 } => n ( B ) = 5

n ( A × B ) = n ( A) × n(B) = 0 × 5 = 0