In each of the experiments, write the events using set notation and mention the total number of elements in each of them. Find the probability of each event :
Three coins are tossd simultaneously. (i) R is the event of getting at least two heads. (ii) Q is the event of getting at least one tail.

Answer

`S=PHHH, HHT,THH, HT T, THT,,T TH, T T T}.n(S)=8`
`(i)R={HHH, HHT, HTH, THH};n(R)=4;P(R)=1/2.`
(ii) `Q={HHT, HTH, THH, HT T, THT, T TH,T T T};n(Q)=7;`
`P(Q)=7/8.`