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 mimimum amount of money that must be spent to determine with certainity the correct labeling of the buttons?
Options
o Rs. 100
o Can not be determined from the given information
o Rs 150
o Rs 50

• answer is D. on spending 50rs one can find a correct button. because its given tht all the stickers are placed wrongly..
  
• 11 years agoHelpfull: Yes(43) No(13)
• You have to put just 50rs.
  
  Put 50rs 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 50rs and pressing Random selection first.
• 11 years agoHelpfull: Yes(29) No(6)
• The answer would be Rs 50 since a single press of the Random button would determine the correct labeling.
  
  Here's the reasoning. Press the Random button. Since all buttons are mislabeled, whatever the Random button produces must be that drinks button (e.g. if tea, label it Tea, otherwise label it Coffee). Now, since the buttons were mislabled, you need only switch the remaining two buttons labels
  
• 11 years agoHelpfull: Yes(21) No(7)
• minimum 150 rs incase of worst case.........
• 11 years agoHelpfull: Yes(10) No(39)
• correct ans 150....sure....1st tym we can check any button amongst 3...then press again it...if it gv difrt resut it's the random button...then press any 1 of remaining 2...u cn understand what that buuton type...last button shud be f last tym no need to press it..so total 3 tymes...so 50*3=150
• 11 years agoHelpfull: Yes(8) No(18)
• it will be 100
• 8 years agoHelpfull: Yes(8) No(3)
• Dear Admin give us the correct answer... ...
  
  __________________________________THANK YOU
• 9 years agoHelpfull: Yes(6) No(1)
• Cant say for sure beacause there is a button who is randomly giving drinnks,
• 11 years agoHelpfull: Yes(5) No(11)
• answer is B. it cant b determined by given information.
• 11 years agoHelpfull: Yes(4) No(23)
• ans is 50 , by spending 50 rs we can say
• 11 years agoHelpfull: Yes(4) No(3)
• I think the ans will be 150.
  It cannot be determined as the random button will be difficult to predict.
• 11 years agoHelpfull: Yes(3) No(13)
• The answer would be Rs 50 since a single press of the Random button would determine the correct labeling.
  
  Here's the reasoning. Press the Random button. Since all buttons are mislabeled, whatever the Random button produces must be that drinks button (e.g. if tea, label it Tea, otherwise label it Coffee). Now, since the buttons were mislabled, you need only switch the remaining two buttons labels.
• 8 years agoHelpfull: Yes(3) No(0)
• Ans is 50.
• 8 years agoHelpfull: Yes(2) No(0)
• Tea Coffee Random
  
  Coffee Random Tea
  
  50 + 50 = 100
  
  1st we spent Rs. 50 then we determine only one that is coffee
  2nd we spent Rs. 50 then we determine other two of the solutions is Random & Tea
  
  So the answer is 50 + 50 = 100 Rupees
• 7 years agoHelpfull: Yes(1) No(0)
• answer is 50 because when we spend 50 rupees we find let suppose tea which name is coffee
  now we have two buttons name -random and tea
  now since we know tea can not present and also random button can not right clearly in random coffee will present and in tea ,random . so minimum price is 50
• 4 years agoHelpfull: Yes(0) No(0)