View source for Four fair coins are to be flipped. What is the probability that all four will be heads or all four will be tails? Express your answer as a common fraction.

A standard deck of 52 cards has 13 ranks (Ace, 2, 3, 4, 5, 6, 7, 8, 9, 10, Jack, Queen, King) and 4 suits (<math>\spadesuit</math>, <math>\heartsuit</math>, <math>\diamondsuit</math>, and <math>\clubsuit</math>), such that there is exactly one card for any given rank and suit. Two of the suits (<math>\spadesuit</math> and <math>\clubsuit</math>) are black and the other two suits (<math>\heartsuit</math> and <math>\diamondsuit</math>) are red. The deck is randomly arranged. What is the probability that the top card is a 5?