Two cards are drawn without replacement from a well-shuffled pack. Find the probability that one of them is an ace of heart
$\frac{1}{{25}}$
$\frac{1}{{26}}$
$\frac{1}{{52}}$
None of these
The probability of getting head and tail alternately in three throws of a coin (or a throw of three coins), is
If two balanced dice are tossed once, the probability of the event, that the sum of the integers coming on the upper sides of the two dice is $9$, 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.
The probability of obtaining an even prime number on each die, when a pair of dice is rolled is
There are $4$ envelopes with addresses and $4$ concerning letters. The probability that letter does not go into concerning proper envelope, is