The probability that a card drawn from a pack of 52 cards will from a pack of 52 cards will be diamond or king being to?

Total ways = 52
There are 13 cards of diamond, 4 cards of king, but one card is king of diamond which is counted both in diamond and king cards
⇒ Favourable ways = 13 + 4 - 1 = 16
∴ Required probability = 16/52 = 4/13