In each of the following experiments specify appropriate sample space A boy has a $1$ rupee coin, a $2$ rupee coin and a $5$ rupee coin in his pocket. He takes out two coins out of his pocket, one after the other.
Let $Q$ denote a $1$ rupee coin, $H$ denotes a $2$ rupee coin and $R$ denotes a $5$ rupee coin. The first coin he takes out of his pocket may be any one of the three coins $Q$, $H$ or $R$. Corresponding to $Q$. the second draw may be $H$ or $R$. So the result of two draws may be $QH$ or $QR$. Similarly, corresponding to $H$, the second draw may be $Q$ or $R$.
Therefore, the outcomes may be $HQ$ or $HR$. Lastly, corresponding to $R$, the second draw may be $H$ or $Q$.
So, the outcomes may be $RH$ or $RQ$.
Thus, the sample space is $S =\{ QH ,\, QR ,\, HQ , \,HR , \,RH ,\, RQ \}$
The probability that an event will fail to happen is $0.05$. The probability that the event will take place on $4$ consecutive occasions is
A die is thrown, find the probability of following events:A prime number will appear,
Cards are drawn one by one without replacement from a pack of $52$ cards. The probability that $10$ cards will precede the first ace is
One card is drawn from a well shuffled deck of $52$ cards. If each outcome is equally likely, calculate the probability that the card will be not a black card.
Three coins are tossed once. Find the probability of getting at most $2$ heads.