Ultimate Quant Marathon Blog For IIM CAT

For All Your Quant Queries

Bonus QUestion 28.07.09

with 10 comments


Suppose K be the number of integers n such that (2^n+1)/n^2 is also an integer.
Then K is
a) 0               b) 1               c) 2              d) 3              e) none of these

Written by Implex

July 28, 2009 at 2:43 pm

10 Responses

Subscribe to comments with RSS.

  1. is it 1

    Haritosh

    July 28, 2009 at 5:59 pm

  2. Only two integer values of n 1 and 3 are the solutions…

    Ans option c….

    Vishal

    July 28, 2009 at 8:22 pm

  3. answer option C is right

    Rahul

    July 29, 2009 at 7:42 am

    • i think its e….we can have any no. of n which even.

      ANKIT PANGHAL

      August 10, 2009 at 10:16 am

  4. only 1 nd 3 so c

    kuldeep

    July 29, 2009 at 4:19 pm

  5. oohh sory i got the qyestion wrong…i thought it is
    (2^n+1)^n/2

    ANKIT PANGHAL

    August 10, 2009 at 10:18 am

  6. Clearly n = 1 and n = 3 satisfies the condition but now we have to prove that 2^n + 1 will never be a factor of n*n for n >3.

    I am clueless here ??

    Balboa

    August 28, 2009 at 10:18 am

  7. What about n=9

    Ravi

    December 1, 2009 at 6:17 pm

  8. hi guys..i know its out of place but i din’t know where to post it..so i m writing it here..i have a question on probability..it goes as..
    please help me solve it..n if its not the right place to ask it..tell me where should i post it..

    There are 5 fruits -Banana,Apple,Orange,Pear and Mango-which are to be served among six boys.If no fruit can be served to more than one boy,find the probability that all the five fruits were served to exactly three boys such that each of the three boys gets at least one fruit.

    answer choices–
    1. 5/8
    2. 25/54
    3. 55/108
    4. 175/324
    5. 125/324

    goodwill2

    December 27, 2009 at 3:46 pm

  9. i posted the previous question..can somebody tell me where to post it

    goodwill2

    December 28, 2009 at 4:19 pm


Leave a Reply

Fill in your details below or click an icon to log in:

WordPress.com Logo

You are commenting using your WordPress.com account. Log Out / Change )

Twitter picture

You are commenting using your Twitter account. Log Out / Change )

Facebook photo

You are commenting using your Facebook account. Log Out / Change )

Google+ photo

You are commenting using your Google+ account. Log Out / Change )

Connecting to %s

%d bloggers like this: