Multiple choice

A box contains 10 green, 20 red, 30 Black and 40 orange marbles. One marble is drawn from the box at random. The probability that marble is neither green nor orange is

  1. $ \displaystyle \frac{1}{2} $
  2. $ \displaystyle \frac{7}{10} $
  3. $ \displaystyle \frac{3}{5} $

  4. None of these
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A Correct answer
Explanation

Total marbles = 10 + 20 + 30 + 40 = 100. Marbles that are neither green nor orange are red and black. Total red and black = 20 + 30 = 50. Probability = 50 / 100 = 1/2.

AI explanation

The total number of marbles in the box is 10 + 20 + 30 + 40 = 100. The number of marbles that are neither green nor orange is the sum of red and black marbles, which is 20 + 30 = 50. The probability of drawing one of these marbles is 50/100. The required probability is 1/2.

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