Question

All jacks, queens and kings are removed from a pack of 52 cards. The remaining cards are well-shuffled and then a card is randomly drawn from it. Find the probability that this card is a black face card 

Answer 1

In a pack of 52 playing cards, there are 4 jack, 4 queen and 4 king cards. 
All jack, queen and king cards are removed from the pack. Then,
Number of remaining cards = 52 − 12 = 40
∴ Total number of outcomes = 40 

There are 0 face cards in the remaining pack of cards.
So, the favourable number of outcomes are 0.
∴ P(drawing a black face card) = \[\frac{\text{ Favourable number of outcomes }}{\text{ Total number of outcomes }} = \frac{0}{40} = 0\]