New Batches at TathaGat !!!               Directions to CP centre
LR problem
by RUPALI GOYAL - Wednesday, 20 August 2014, 11:27 PM
  A train stops at exactly six intermediate stations - A, B, C, D, E and F - in that order, between its originating station and destination station. At each of the intermediate stations, twice as many people get in as those that get down. The number of people getting down at the intermediate stations are all prime numbers, one each between 0 and 10, 10 and 20 and so on upto between 50 and 60, in the order of the stations given above. The difference between the number of people getting in at any two consecutive intermediate stations is at least 20. The total number of passengers getting down in all the intermediate stations together is an even number. Also no person gets in and gets down (or vice versa) at the same station.

Q.        Which of the following cannot be the number of people getting down at any intermediate station?
a)         47       
b)          3       
c)         17       
d)         23    
Re: LR problem
by TG Team - Friday, 22 August 2014, 11:29 AM
  Hi Rupali smile

We are to just pick 6 prime numbers, one each from the given ranges (i.e. 0 to 10, 11 to 20, 21 to 30, 31 to 40, 41 to 50 and 51 to 60) such that difference between two consecutively selected prime numbers is at least 10.

Also as sum of all 6 prime numbers is even, so each of six prime numbers must be ODD.

It can be easily checked that selected prime numbers can be: 3-13-23-37-47-59 only.

Thus required answer is (c) 17. smile

Kamal Lohia