Concept: If A,B and C are 3 independent events, then P(A∩B∩C)=P(A)×P(B)×P(C) Calculation: Given coin is biased heads comes up thrice as likely as tails. ⇒P(H)=
3
4
and P(T)=
1
4
Let, T be a random variable for the no. of tails for 3 independent tosses. ⇒P(T=0)=P(HHH)=(