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  1. Chapter 15 Class 10 Probability
  2. Serial order wise
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Ex 15.2, 5 A jar contains 24 marbles, some are green and other are blue. If a marble is drawn at random from jar, the probability that it is green is 2/3 . Find the number of blue balls in the jar. Total number of marbles = 24 Let number of green marbles = x Then, Number of blue marbles = 24 − x Given, probability of drawing a green marbles = 2/3 (𝑁𝑢𝑚𝑏𝑒𝑟 𝑜𝑓 𝑔𝑟𝑒𝑒𝑛 𝑚𝑎𝑟𝑏𝑙𝑒𝑠)/(𝑇𝑜𝑡𝑎𝑙 𝑁𝑢𝑚𝑏𝑒𝑟 𝑜𝑓 𝑚𝑎𝑟𝑏𝑙𝑒𝑠) = 2/3 𝑥/24 = 2/3 𝑥 = 2/3 × 24 𝑥 = 2 × 8 𝑥 = 16 ∴ Number of green marbles = 𝑥 = 16 Number of blue marbles = 24 − x = 24 − 16 = 8

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