Latest Infosys Aptitude Question SOLUTION: Every station in N railroad issues every other station ticket. Some stations are added. Now they have to issue 46 more tickets. Give the No. of stations after and before added.

• Placement Papers
• /
• Infosys
• /
• Logical Reasoning
• /
• Mathematical Reasoning

Infosys Question Papers: Infosys Interview Experience(10) INFOSYS Company Profile

(#M40009039) INFOSYS Logical Reasoning question Countings Keep an EYE

Every station in N railroad issues every other station ticket. Some stations are added. Now they have to issue 46 more tickets. Give the No. of stations after and before added.

Asked In Infosys Vignesh (12 years ago)

Unsolved Read Solution (3)

Is this Puzzle helpful?   (14)   (4) Submit Your Solution Mathematical Reasoning

Read Solution (3) :

Pargat Pal Singh  (12 years ago)

Let newly added one be x.

the earlier stations are n. , then

total number of tickets issued earlier = n(n-1)

n(n-1) + 46 = (n+x)(n+x-1)

n^2 - n + 46 = n^2 + x^2 + 2nx -n-x, thus
x^2 + 2nx -x = 46, since x,n are integers, and 46 is expressed as, 2*23 or 1*46

considering x(x+2n-1) ,
if x = 2, n =11
if x=1, n = 23
hence no of stations before and after are
{11,13}
No of tickets earlier = 11*10=110
No of tickets later = 13*12= 156
or
{23,24}
No of tickets earlier = 23*22=506
no of tickets later = 24*23= 552

Is this solution Helpfull? Yes (11) | No (4)  

nikhil  (8 years ago)

oye sardar g (@PARGAT PAL SINGH) tussi great ho g...

Is this solution Helpfull? Yes | No   

Arnab  (7 years ago)

Pragat Pal Singh You are Great.

Is this solution Helpfull? Yes | No   

Please Login to Read Solution.