Correction: I meant to say near the end that if you were writing an online whiteboard for wide use, you wouldn't want to use a DIRECT websocket connection like I've done, where the connection is from the tutor's computer to the student's browser, because then all the tutors using your software would have to mess around with port forwarding. (Or maybe I'm wrong; there might be a way to use STUN/TURN/ICE. I'm no expert on this.) You may want to use websockets for each computer to communicate with the server however.
Hi can you please give a video solution to this problem, I will be very thankful The problem is-------- A set T is called even if it has an even number of elements. Let n be an even positive integer and let S1,S2,......,Sn be even subsets of S={1,2,......,n}.prove that their exist i and j , 1
I'm not sure I understand the question. Firstly, why would there be exactly n even subsets? For example, for n=4, S={1,2,3,4}, I count 8 even subsets: ∅, {1,2}, {1,3}, {1,4}, {2,3}, {2,4}, {3,4}, and S itself. Putting that issue aside, for n≥2 can't we just pick Si = ∅ and Sj = any other even subset, then their intersection is ∅ which is an even subset? So maybe they meant that the empty set doesn't count as an even set. Then for n≥4 we could just say Si = {1,2} and Sj = {1,2,3,4}, then Si ∩ Sj = {1,2}, which is even. For n
