Find value of 10C3

a.720
b.240
c.120
d.1000

• 
  nCr=nC(r-1)=10c3=10c7
  n!/(n-r)! r!
  10!/(10-3)! 3!
  10*9*8*7!/7!*3!=120
  
• 10 years agoHelpfull: Yes(0) No(0)
• nCr= n! / { (n-r)! * r! }
  10C3= 10! / { (10-3)! * 3! } = 120
  note: n!= n*(n-1)*(n-2)*..........*(n-(n-1)
  0!= 1
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