InterviewSolution
Saved Bookmarks
InterviewSolution
| 1. |
A fair coin is tossed until one of the two sides occurs twice in a row. The probability that the number of tosses required is even isA. `1//3`B. `2//3`C. `1//4`D. `3//4` |
|
Answer» Correct Answer - B `(b)` `A={HH,HTHH,HTHTHH,…}` or `B={TT,THTT,THTHTT,…}` `P(A)=(1)/(2^(2))+(1)/(2^(4))+(1)/(2^(6))+.....=((1)/(4))/(1-(1)/(4))=(1)/(3)=P(B)` `:.` Required probability `=(1)/(3)+(1)/(3)=(2)/(3)` |
|