GATE CSE
First time here? Checkout the FAQ!
x
+1 vote
40 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 (12.3k points)   | 40 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

Please log in or register to answer this question.

Top Users Jan 2017
  1. Debashish Deka

    7090 Points

  2. Habibkhan

    4676 Points

  3. Vijay Thakur

    4224 Points

  4. saurabh rai

    4014 Points

  5. sudsho

    3982 Points

  6. Arjun

    3138 Points

  7. GateSet

    3088 Points

  8. santhoshdevulapally

    3004 Points

  9. Bikram

    2976 Points

  10. Sushant Gokhale

    2824 Points

Monthly Topper: Rs. 500 gift card

18,816 questions
23,786 answers
51,458 comments
20,133 users