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.
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