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A bag contains nine yellow balls, three white balls and four red balls. In how many ways can two balls be drawn from the bag?

Correct answer: C. ¹⁶C₂

  • A. ⁹C₂
  • B. ³C₂
  • C. ¹⁶C₂
  • D. ¹²C₂

Explanation

There are 9 + 3 + 4 = 16 balls in total, and drawing two balls without regard to order gives 16C2 = (16 x 15)/2 = 120 ways. The likely trap is option d, 12C2, which counts only the yellow and white balls and leaves out the four red balls.

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