A fair coin is tossed 10 times. find the probability that two heads dont occur consecutively ?
Approach plz !

1) 1/2^4
2) 1/2^3
3) 1/2^5
4) NOT

• let us take in the first attempt we got head (prob =1/2) next we should get in 3 rd time next 5th time ,7 th time ,9 th time total 5 times so total prob is 1/2^5
  and if we got head in second time -> 2nd ,4 th, 6th,8 th 10 th total 5 times
  sum the both === 1/2^5 +1 /2^5 = 2(1/2^5)= 1/2^4
  so the answer is option 1 ========== 1/2^4
• 9 years agoHelpfull: Yes(2) No(1)