17 people(a1,a2----a17) are invited to a party. the host and hostess shake hands with an invitee and also with each-other.the invitee shake hands in circular manner i.e. pairs(a1,a2)(a2,a3)---(a16,a17)(a17,a1) shake hand and total of 52 shake hands.Let S be
people such that every pair shake hands.The size of S is 4,1,2,3

• size of s will be 4 (host H1,hostess H2,a1,a2)... 17 people=8*2+1
  in each set, possible handshakes are (h1a1,h1a2,h2a1,h2a2,a1a2 and h1h2)=4c2=6
  no of sets are 9.i.e (8+1) in 9th set persons are (H1,H2 and a17).in this set possible handshake=3c2= 3 (h1h2,h1a17,h2a17) plus one more handshake (a17a1)
  so total handshake= 8*6 +3+1=52
• 13 years agoHelpfull: Yes(3) No(0)
• Answer is 3
  Set S will be comprised of handshakes between host and hostess,b/w host and invitees and b/w hostess n invitees.
• 13 years agoHelpfull: Yes(2) No(4)