.45 matches .Each team plays with other only one match.(no repeatation) find number of teams?

• Ans:10 teams, we can see that in 10 teams 1st team have to play with 9 other teams, 2nd team has to play with 8 other teams,3rd team has to play with 7 other teams, similarly upto last team it will occur, so the total is 9+8+7+6+5+4+3+2+1=45......
• 11 years agoHelpfull: Yes(45) No(0)
• nc2 =45
  n(n-1)=90
  n=10 ans
• 11 years agoHelpfull: Yes(34) No(0)
• Ans:-10.
  by using the simple formula:-
  nc2=45
  (n*(n-1))/2=45
  n(n-1)=90
  n=10.Hence no of team is equal to 10.
  
  
  
• 11 years agoHelpfull: Yes(7) No(2)
• n*(n-1)/2=90
  div by 2 bcoz 2team play 1 match
  solving we get n=10
  
• 11 years agoHelpfull: Yes(4) No(0)
• 90 ..1match=2teams,45matchs=90teams
• 11 years agoHelpfull: Yes(3) No(12)
• 9 teams as 9+8+7+6+5+4+3+2+1=45
• 11 years agoHelpfull: Yes(1) No(4)
• Manender babu agar aap se koi puche ki 10 team h aur 10 apas me khele tho kitna match hoga tho sayad apki ans hoga 5 ya sb team ka apna apna game
• 11 years agoHelpfull: Yes(1) No(0)
• nCr=45
  n!/(n-2)!*2! is equal to 45
  n(n-1) (n-2)!
  -----------------=45
  (n-1)! *2
  
  after cancellation of (N-2)!
  n(n-1)=90
  n=10
  SO the number if team is 10
• 8 years agoHelpfull: Yes(1) No(0)
• ans--(2)^45
  since one team can play with other only one match and the winner team will play with other team in next match....so in last match(45th) there will be 2 teams;in 44th dere will b 4 teams and so on...so total no of teams will b 2^45
• 11 years agoHelpfull: Yes(0) No(8)
• if each team will play 1-1 match with all than ans wil chang
• 11 years agoHelpfull: Yes(0) No(4)
• nC2=45
  then n(n-1)=90
  n^2-n-90=0
  n^2-10n+9n-90=0
  n(n-10)+9(n-10)=0
  (n-10)(n+9)=0
  so n-10=0
  n=10 answer
• 7 years agoHelpfull: Yes(0) No(0)