122.

If U = {a, b, c, d, e, f, g, h, k}, A = {a, b, c, d), B  = {b, d, f, h}, C = {c, d, e, f} find 

(a) B'     (b)   C'          (e)   (B - C)'

Find the following to make them true statements :

Prove that :  

If A, B and C be three sets, then

In a group of 400 people, 250 can speak Hindi and 200 can speak English. How many people can speak both Hindi and English?

In a committee, 50 people speak French, 20 speak Spanish and 10 speak both Spanish and French. How many speak at least one of these two languages?