Question 21

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Question 21

Post by TECHNOTHLON on Thu Jul 21, 2016 12:30 am

Once inside the tunnel they walk a long distance before coming to a halt in front of a huge gate with a chest placed near it. It is written that the key of the gate is in the chest.

Question 21 :
The chest is locked by a number of padlocks. All padlocks must be unlocked in order to open the chest. 12 Copies of the keys to the padlocks are distributed lie next to it, such that any group of 7 or more keys can open the chest should they choose to do so, but any group of less than 7 cannot. What is the minimal number of padlocks required to achieve this?
(a) 330 (b) 495 (c) 792 (d) 924

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Re: Question 21

Post by @ImAJinkya_1707 on Sat Jul 23, 2016 10:15 am

Answer is c)792

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easy

Post by dhwajrajsinh on Sat Jul 23, 2016 6:31 pm

Ans is 924

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Re: Question 21

Post by Poirot on Sat Jul 23, 2016 9:05 pm

792 must be correct

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Re: Question 21

Post by Devansh on Sun Jul 24, 2016 8:51 am

Ans is 792

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hi

Post by dhwajrajsinh on Sun Jul 24, 2016 10:24 am

Plz explain

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Re: Question 21

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