From a pack of $52$ cards one card is drawn at random, the probability that it is either a king or a queen is
From a pack of $52$ cards one card is drawn at random, the probability that it is either a king or a queen is
- A
$\frac{1}{{13}}$
- B
$\frac{2}{{13}}$
- C
$\frac{3}{{13}}$
- D
$\frac{4}{{13}}$
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$A:$ getting an even number on the first die.
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$A:$ getting an even number on the first die.
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- [KVPY 2021]
If $P(A) = 0.65,\,\,P(B) = 0.15,$ then $P(\bar A) + P(\bar B) = $
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Three letters are dictated to three persons and an envelope is addressed to each of them, the letters are inserted into the envelopes at random so that each envelope contains exactly one letter. Find the probability that at least one letter is in its proper envelope.
Three letters are dictated to three persons and an envelope is addressed to each of them, the letters are inserted into the envelopes at random so that each envelope contains exactly one letter. Find the probability that at least one letter is in its proper envelope.