[msksent]

Originally Posted by sapanjain

2.A coin is so unbalanced that it may come both heads in 2 tosses as it may come tails in a single toss. What is the probabality of getting a head in a single toss.

Is the answer 1/2.

[msksent]

Originally Posted by sapanjain

3.A local forecast service has accuracy of 2/3 says No rain , and Meteriological service having accuracy of 4/3 says Rain. if Preference is as no rain what is the chance of rain?

Here 1/3 for the first and 4/5 for the scond and hence the probability of raining will be 4/15.
4/3 is given in the problem which may be wrong.

[Naresh Reddy]

Originally Posted by sapanjain

2.A coin is so unbalanced that it may come both heads in 2 tosses as it may come tails in a single toss. What is the probabality of getting a head in a single toss.

Msksent ur answer for 1st qn is right.. 3rd qn is not clear..

2)..let prob of head in a toss be p & of tail be q then ..p+q=1
In two tosses probability of two heads is 2C0 *p^2*q^0= p^2

given p^2=q (both heads in 2 tosses as it may come tails in a single toss)

so p^2=1-p solving we get prob of a head in a single toss= p=( 5^0.5 -1 )/2 ANS

[Apple]

Originally Posted by msksent

Is the answer 1/2.

U r wrong msksent.
Answer shud be (5^0.5 - 1)/2.

[msksent]

Originally Posted by Naresh Reddy

Msksent ur answer for 1st qn is right.. 3rd qn is not clear..

2)..let prob of head in a toss be p & of tail be q then ..p+q=1
In two tosses probability of two heads is 2C0 *p^2*q^0= p^2

given p^2=q (both heads in 2 tosses as it may come tails in a single toss)

so p^2=1-p solving we get prob of a head in a single toss= p=( 5^0.5 -1 )/2 ANS

Thanks for the explanation and now i am clear.

[sapanjain]

Hey Msksent, Apple and Naresh ,

I got thru Infosys written test today.....have my interview on 3rd plz help with these infy interview questions and tell me any other dat u know :

1)60-60=60 what can u derive from it?

2)They gave me 2 paper Cutting of Tringale shapes and asked me 2 construct pyramid without folding?

3)They asked me 2 prove half of 12 is 7?

4)They gave me 6match sticks and asked 2 consturuct 6 equilateral triangles?

5) They gave me 5 new one rupee coins and asked me 2 arrange in such a way that each and every coin 2 touch other 4 coins?


6) 5+5+5 , u have 2 make just a slight change and make it 550?

7) u r going in a forest and suddenly u saw a tiger in front of u roaring at u, wat will u do? a) I’ll esacpe
b) I’ll attack it
c)I’ll convince it not 2 kill me
d) I’ll stand still

use eight 8’s and make 1000.

9)using four 5’s make 56.

10)if ur house catches fire wat will u do first?

11)u were given a magnet and an Iron piece of same size and same weight u don’t know at is what, how will u differeciate it with out using Thread.

12)there is an ant on the top left corner of a cube, show it the shortest path in order 2 reach bottom right corner.

[shiks]

hi sapanjain,

i've my written test on 9th oct.how was ur interview.....
plz post d ques u were asked in d interview......n how was d written test...
plz post soon.....
wish u all d bst

[shiks]

plz answer this.....

1. how to measure 15 hrs using 7hr hourglss n 11 hr hourglss??

2. A clock takes 7 secs to strike 7 ,how long will it take to strike 10?

3. A child questions his father, "What is your father's age", to which the father answers "He was aged X in year X^2 (X square) ". If the context is 20th Century, What is his Date of Birth?

4. Escalator based ques::
There is an escalator and 2 persons move down it. A takes 50 steps and B takes 75 steps while the escalator is moving down. Given that the time taken by A to take 1 step is equal to time taken by B to take 3 steps. Find the number of steps in the escalator while it is stationary.

Plz post d ans with exp solns asap.....

[Apple]

Originally Posted by shiks

plz answer this.....

1. how to measure 15 hrs using 7hr hourglss n 11 hr hourglss??

2. A clock takes 7 secs to strike 7 ,how long will it take to strike 10?

3. A child questions his father, "What is your father's age", to which the father answers "He was aged X in year X^2 (X square) ". If the context is 20th Century, What is his Date of Birth?

4. Escalator based ques::
There is an escalator and 2 persons move down it. A takes 50 steps and B takes 75 steps while the escalator is moving down. Given that the time taken by A to take 1 step is equal to time taken by B to take 3 steps. Find the number of steps in the escalator while it is stationary.

1)this is simple ............
first invert both of them now when 7hr glass shows 7hr invert it again and when 11 hr glass shows 11 hr again invert the 7hr glass at that moment and whenever now the whole sand comes in the bottom half (in the 7hr one), it will be 15 Hrs.
2)10 sec
3)we will not b able to find date of birth but birth year will be 1892.
X=44

hope u got it
Cheers Apple

[sapanjain]

Originally Posted by shiks

hi sapanjain,

i've my written test on 9th oct.how was ur interview.....
plz post d ques u were asked in d interview......n how was d written test...
plz post soon.....
wish u all d bst

Hi,

i cudnt make it thru the technical interview. I have an exp. of 1.2 years in .NET so they asked me questions based on dat.I kinda screwed up !
about the written test....half of the problems were from old Infy papers.....so make sure u solve as many as u can......i got 8/10 right......dont know much about the cut off.....they called 75/1000 for interview.
need any help....lemme know !