Question

( P(H)=2 P(T) )
( P(H)+P(T)=1 )
( Rightarrow P(H)=frac{2}{3} )
( Rightarrow P(T)=frac{1}{3} )
Pobability of 2 tails 8 I head
( =frac{3}{4}left(frac{1}{3}right)^{2}left(frac{2}{3}right) )
( =3 times frac{1}{9} times frac{2}{3}=frac{2}{9} )

# 3/ An unfair coin is such that when it is tossed, the head is twice as likely to occur as the tail. If the coin is tossed 3 times, what is the probability of getting 2 tails and I head? (WAEC)

Solution