A drinks machine offers three solutions “ Tea, Coffee or Random but the machine has been wired up wrongly so that each button does not give what it claims. If each drink costs Rs. 50, what is the minimum amount of money that must be spent to determine with certanity the correct labeling of the buttons?

• You have to put just 50p.
  
  Put 50p and push the button for Random. There are only 2
  possibilities. It will give either Tea or Coffee.
  
  ? If it gives Tea, then the button named Random is for Tea.
  The button named Coffee is for Random selection. And the
  button named Tea is for Coffee.
  
  ? If it gives Coffee, then the button named Random is for
  Coffee. The button named Tea is for Random selection. And
  the button named Coffee is for Tea.
  
  Thus, you can make out which button is for what by putting
  just 50p and pressing Random selection first.
• 11 years agoHelpfull: Yes(29) No(0)
• 50,
  we have 3 drinks, and each button does not give what it claims.
  So, when we press first button - let it be of TEA, but it provides us coffee.
  after this we may infer that-
  coffee(button)-random, &
  random(button)-tea
• 11 years agoHelpfull: Yes(19) No(2)
• 50 is the ans???
• 11 years agoHelpfull: Yes(3) No(3)
• You have to put just 50p.
  
  Put 50p and push the button for Random. There are only 2
  possibilities. It will give either Tea or Coffee.
  
  ? If it gives Tea, then the button named Random is for Tea.
  The button named Coffee is for Random selection. And the
  button named Tea is for Coffee.
  
  ? If it gives Coffee, then the button named Random is for
  Coffee. The button named Tea is for Random selection. And
  the button named Coffee is for tea
• 11 years agoHelpfull: Yes(2) No(2)
• 50
  first u put 50rs then press random if u get coffee then random id for coffee and then obviously as given in que they give wrong ans so coffee will give tea and tea will give random
• 11 years agoHelpfull: Yes(1) No(0)
• ans 50
  we have 3 drinks, and each button does not give what it claims.
  So, when we press first button - let it be of TEA, but it provides us coffee.so whn we press another it provides random last one must be tea
• 11 years agoHelpfull: Yes(1) No(0)
• please can anyone explain what random means , if we select random button we don"t know is it random or correct
  
• 9 years agoHelpfull: Yes(0) No(0)