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There are 3 ants at 3 corners of a triangle, they randomly 
start moving towards another corner. What is the 
probability that they don't collide?
 Question Submitted By :: Requirements-Management
I also faced this Question!!     Answer Posted By  
# 1
The probability is 25% because there are 3 ants all with
two possible paths and 8 total possible outcomes. But
there are two possible outcomes that the ants don't
collide. Either they move one way or the other. 2/8 = 25%.
Is This Answer Correct ?    69 Yes 8 No
# 2
Each ant can move in 2 directions. Lets say direction are
Left (L) and Right (R). Solution if all ants move either
towards L or R. For L (1/2 * 1/2 * 1/2) = 1/8. Same for R =
1/8. Total for L and R = 1/8 + 1/8 = 1/4.
Is This Answer Correct ?    59 Yes 2 No
# 3
To prevent collision ants have to move in this particular way
A-->B,B-->C,C-->A ; probability=(1/2*1/2*1/2)

in opp direction
A-->C,C-->B,B-->A ; probability=(1/2*1/2*1/2)

probability that the ants doesnt coincide=

ans. 1/4
Is This Answer Correct ?    21 Yes 1 No
Sandeep Reddy
# 4
actually we have to take care that no 2 ants should
collide....therefore, that is only possible if 1st follows
the second and second follows the third and third follows
the it can be either clockwise or
anticlockwise....hence 2 ways out of 8 ways.....ans is
Is This Answer Correct ?    4 Yes 1 No
# 5
Actually we can say with absolute certainty that two of the
ants will move in the same direction. One of them may not.
It is a trick question. There is a 50/50 chance that one of
the ants may not move in the same direction as the other two.
So the answer is 50%.
Is This Answer Correct ?    1 Yes 2 No
# 6
How do you consider that the ants can move only in 2
directions (L or R) ? They could even move "randomly", say
straight, collide, and then move to some corner..
Is This Answer Correct ?    1 Yes 18 No

Other Requirements Management Interview Questions
  Question Asked @ Answers
Two MIT math graduates bump into each other at Fairway on the upper west side. They hadn't seen each other in over 20 years. The first grad says to the second: "how have you been?" Second: "Great! I got married and I have three daughters now" First: "Really? how old are they?" Second: "Well, the product of their ages is 72, and the sum of their ages is the same as the number on that building over there.." First: "Right, ok.. oh wait.. hmmmm.., I still don't know" second: "Oh sorry, the oldest one just started to play the piano" First: "Wonderful! my oldest is the same age!" Problem: How old are the daughters? HSBC 3
Find the number of sides of a regular convex polygon whose angle is 40degrees. Syntel 4
If during some stage down the life cycle, the initial requirements change, what will you do? How will you handle any changes in the requirements? IGT 1
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While doing HLD/LLD/Coding/Testing, how do you know that a specific HLD/LLD component, program code unit, or test case relates to a particular requirement?   1
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