home security provides a security code for the door which consist of five buttons . code may be generated by pressing any one button , any three any four or all five how many such codes are possible ? 1> 32 2> 10
3>31 4>5

• option :> < 3>=31
  
  for any one buttion no of combination=5c1=5
  for any 3 total no of combination=5c3 *fact 2=20
  for 4 =5c4 *fact 1=5
  for 5=1
  total=5+20+5+1=31
  
  
• 9 years agoHelpfull: Yes(8) No(4)