if-x-and-y-are-two-sets-such-that-n-x-17-n-y-23-and-n-X-Y-38-find-n-X-Y-

Question Number 9423 by Rohit kumar last updated on 08/Dec/16

i f x a n d y a r e t w o s e t s s u c h t h a t n (x)

= 17, n (y) = 23 a n d n (X \cup Y) = 38,

f i n d n (X \cup Y) .

Commented by sandy_suhendra last updated on 08/Dec/16

do you mean n (X \cap Y) ?

Commented by Rohit kumar last updated on 08/Dec/16

x \cup y

Commented by RasheedSoomro last updated on 08/Dec/16

n (x \cup y) = 38 (Given)

Answered by sandy_suhendra last updated on 08/Dec/16

n (X \cup Y) = n (X) + n (Y) - n (X \cap Y)

where \cup = unions and \cap = intersections