If Jesse flips a coin seven times in a row, what is the probability that the result will not be tails for more than 2 times?	Answers
A) 21/128  B) 29/128  C) 35/128  D) 1/16  E) 1/4
Not more than 2 times tails = at least 5 times heads   Atleast 5 heads in 7 flip.   The total outcome of flip is = 2^7 = 128   For any Coins problem write the ask in the shown format.   HHHHHTT   HHHHHHT   HHHHHHH   Once you have written in the above mentioned format the answer is pretty straight.   HHHHHTT = [7!]/5!*2! = 21   HHHHHHT = [7!]/6! = 7   HHHHHHH = [7!]/[7!] = 1   Sum 7  / 7= 
<gadget id="calculator">7  / 7</gadget>
<output>1</output>
1   Sum= 21+7+1= 
<gadget id="calculator">21+7+1</gadget>
<output>29</output>
29/128   Answer - 29/128
<result>B</result>
If Jesse flips a coin seven times in a row, what is the probability that the result will not be tails for more than 2 times?