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A pack of card is well shuffled and . Top 25 cards are removed. From the remaining cards 14th card from top is picked find the probability of card being an Ace or a Spade.

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    There will be 16 cards or in other words favourable events.2012-06-21

1 Answers 1

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The chosen card is the $39$-th from the top of the shuffled deck. All permutations of the deck are equally likely, so each of the $52$ cards is equally likely to be in the $39$-th position. $16$ cards are either an ace, a spade, or both, so the probability of getting one of these cards is

$\frac{16}{52}=\frac4{13}\;.$