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 ( $\spadesuit$ , $\heartsuit$ , $\diamondsuit$ , and $\clubsuit$ ), such that there is exactly one card for any given rank and suit. Two of the suits ( $\spadesuit$ and $\clubsuit$ ) are black and the other two suits ( $\heartsuit$ and $\diamondsuit$ ) are red. The deck is randomly arranged. What is the probability that the top card is a 5?

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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.