"Playing Music on Random Setting Suppose that a Spotify playlist has 13 tracks. After listening to all the songs, you decide that you like 5 of them. With the random feature on the playlist, each of the 13 songs is played once in random order. Find the probability that among the first two songs played:
b. You like neither of them."
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1
Identify the total number of songs in the playlist, which is 13, and the number of songs you like, which is 5. Therefore, the number of songs you do not like is 13 - 5 = 8.
Understand that the problem asks for the probability that neither of the first two songs played is one you like. This means both songs must come from the 8 songs you do not like.
Calculate the total number of ways to choose the first two songs from all 13 songs. Since the order matters (songs are played in sequence), this is a permutation: \(\text{Total ways} = 13 \times 12\).
Calculate the number of favorable ways to choose the first two songs from the 8 songs you do not like. Similarly, this is: \(\text{Favorable ways} = 8 \times 7\).
Find the probability by dividing the favorable outcomes by the total outcomes: \(P = \frac{8 \times 7}{13 \times 12}\). This fraction represents the probability that neither of the first two songs played is one you like.
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Key Concepts
Here are the essential concepts you must grasp in order to answer the question correctly.
Probability of Events
Probability measures the likelihood of an event occurring, expressed as a number between 0 and 1. It is calculated by dividing the number of favorable outcomes by the total number of possible outcomes. Understanding how to identify favorable outcomes is essential for solving probability questions.
Combinatorics involves counting the number of ways events can occur, often using combinations or permutations. In this problem, since songs are played in random order without replacement, counting the number of ways to select songs you like or dislike is crucial to finding the correct probability.
Sampling without replacement means once an item is selected, it cannot be chosen again. Here, songs are played in random order without repeats, so the probability changes after each song is played. This affects how probabilities are calculated for sequential events.