Interview Q&A / Aptitude

1. How do you solve probability questions on coins, dice and cards?

   Probability = favourable outcomes / total outcomes, when all outcomes are equally likely. List the sample space carefully. Two coins have 4 outcomes, two dice have 36, a deck has 52 cards. For "at least one" questions, use 1 minus the probability of none.

   IntermediateIn-depth4 min read
2. How do you solve speed, distance and time questions, including trains and relative speed?

   Use distance = speed x time and convert km/h to m/s by multiplying by 5/18. A train crossing a pole covers its own length; crossing a platform or another train covers both lengths. Add speeds when objects move in opposite directions and subtract when they move in the same direction.

   IntermediateIn-depth4 min read