Latest Infosys Aptitude Question SOLUTION: Sunny to pick as number of cards from a deck of cards. Sunny picks 1st card, another card by skipping 1 card, Picks another card by skipping two, so on skipping 1 card more each ti

• Placement Papers
• /
• Infosys
• /
• Logical Reasoning
• /
• General Mental Ability

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

(#M40004204) INFOSYS Logical Reasoning question infosys puzzle Keep an EYE

Sunny to pick as number of cards from a deck of cards. Sunny picks 1st card, another card by skipping 1 card, Picks another card by skipping two, so on skipping 1 card more each time. Ultimately he finds that he has picked up 5% of the cards. can you find out the no of cards?

Asked In Infosys (12 years ago)

Unsolved Read Solution (1)

Is this Puzzle helpful?   (1)   (0) Submit Your Solution General Mental Ability

Read Solution (1) :

saurabh  (12 years ago)

(1),2 ,(3), 4, 5 ,(6),7 ,8, 9,(10), 11 ,12,13,14,(15).......so on
card no. inside the bracket will be selected
now n*(n+1)/2
if n=1 then n*(n+1)/2 = 1st card selected ,total card =1
if n=2 then n*(n+1)/2 = 3rd card is selected , total cards are 2
if n=3 then n*(n+1)/2 = 6th card is selected , total cards are 3
......................................../
.....................................so on
if n=n then n cards will be selected from n*(n+1)/2 cards

n
----------- *100= 5
n*(n+1)/2

n=39

hence total cards are 39(39+1)/2= 39*20= 780

thank you..

Is this solution Helpfull? Yes (1) | No (1)  

Please Login to Read Solution.