Respuesta :

This is equivalent to 

P(H then H))
+ P(t then H)
+ P(H then T)

= 3( 1/2 *1/2)

= 3/4
[tex]\text{P(At least one head) = 1 - P(TT)}[/tex]

[tex]\text{P(TT)} = (\frac{1}{2})^{2}[/tex]
[tex]\text{P(At least one head)} = 1 - \frac{1}{4}[/tex]
[tex] = \frac{3}{4}[/tex]