A box contains 5 red, 7 blue, and 8 green marbles. If one marble is drawn at random, what is the probability it is not green?
["Understanding Marble Probability: What’s the Chance of Drawing a Non-Green Marble?", "When presented with a box containing different colored marbles, understanding probability helps us make informed decisions—whether you're playing a game, collecting marbles, or analyzing data. In this article, we explore a classic probability question: If a box contains 5 red, 7 blue, and 8 green marbles, what is the probability of drawing a marble that is NOT green?", "---", "### The Marble Setup", "Let’s break down the given information:", "- Red marbles: 5\n- Blue marbles: 7\n- Green marbles: 8", "Total number of marbles = 5 + 7 + 8 = 20 marbles", "We are asked to find the probability that a randomly drawn marble is not green.", "---", "### What Does “Not Green” Mean?", "To find the probability of drawing a non-green marble, we consider all marbles that are either red or blue.", "Total non-green marbles = red + blue = 5 + 7 = 12 marbles", "---", "### Calculating the Probability", "The probability of an event is calculated as:", "[\n\ ext{Probability} = \frac{\ ext{Number of favorable outcomes}}{\ ext{Total number of possible outcomes}}\n]", "So, the probability of drawing a marble that is not green is:", "[\n\frac{12}{20} = \frac{3}{5} = 0.6\n]", "Or in percentage: 60%", "---", "### Why This Matters", "Understanding such probability problems helps improve decision-making in games, quality control, and statistical analysis. In this case, knowing there’s a 60% chance of picking a red or blue marble can influence your strategy or expectations.", "---", "### Final Answer", "The probability of drawing a marble from the box that is not green is 3/5 or 60%.", "---", "If you're curious about complementary probabilities, remember:\n[\nP(\ ext{not green}) = 1 - P(\ ext{green}) = 1 - \frac{8}{20} = 1 - 0.4 = 0.6\n]", "This simple problem illustrates how easy it is to calculate non-green outcomes in a multicolored system—making probability both practical and powerful.", "---", "Keywords: probability, marble probability, not green marble, 5 red marbles, 7 blue marbles, 8 green marbles, probability calculation, statistics, chance, data analysis.\nMeta Description: Learn how to calculate the probability of not drawing a green marble from a set of 5 red, 7 blue, and 8 green marbles—60% chance of picking a red or blue marble."]
