GATE CSE
First time here? Checkout the FAQ!
x
+1 vote
57 views
A fair coin is tossed until the same result turns up in succession(two head or two tail).Find the probability the number of tosses neede are even..

my approach ..P={P(x=2)+P(x=4)+P(x=6)+...}=0.33

Me answer 2*{P(x=2)+P(x=4)+P(x=6)+...}=0.66

what is the reason of this 2 multiplication?
asked in Probability by Veteran (18.4k points)   | 57 views

How to get success 

Either by HH , HTHH , HTHTHH , HTHTHTHH..........

OR 

TT , THTT , THTHTT , THTHTHTT 


I guess you took only 1 case.

got that! thanks

Your answer

Your name to display (optional):
Privacy: Your email address will only be used for sending these notifications.
Anti-spam verification:
To avoid this verification in future, please log in or register.

Related questions



Top Users Apr 2017
  1. akash.dinkar12

    3660 Points

  2. Divya Bharti

    2576 Points

  3. Deepthi_ts

    2040 Points

  4. rude

    1966 Points

  5. Tesla!

    1768 Points

  6. Debashish Deka

    1614 Points

  7. Shubham Sharma 2

    1610 Points

  8. Arunav Khare

    1464 Points

  9. Arjun

    1440 Points

  10. Kapil

    1426 Points

Monthly Topper: Rs. 500 gift card

22,084 questions
28,059 answers
63,274 comments
24,158 users