Question

If n(X)=200,x)=300 and n(XUY)=400

Answer 1

Answer:

${ \boxed{ \bf{formular : { \tt{n(X{ \small{U}Y) = n(X) + n(Y) - n(X{ \small{n}Y)}}}}}}} \\ n(X{ \small{n}}Y) = (200 + 300) - 400 \\ = 500 - 400 \\ { \boxed{n(X{ \small{n}}Y) = 100}} \\ \\ { \underline{ \blue{ becker \: jnr}}}$

Answer 2

Thamaniya so much I need this so + er