Multiple choice

In a bag, 6 blue and 4 red marbles are placed. In how many different ways can four marbles be selected such that at least one blue marble should be there?

  1. 209

  2. 90

  3. 80

  4. 114

  5. 199
Reveal answer Fill a bubble to check yourself
A Correct answer
Explanation

Total ways to choose 4 marbles from 10 is 10C4 = 210. Ways to choose 4 marbles with zero blue (all red) is 4C4 = 1. Ways with at least one blue = Total - zero blue = 210 - 1 = 209.

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