Mathematics · Probability and Logic
Blue, white, and yellow balls are placed in a line with an equal number of each color. The total number of balls in the line is 30. How many white balls are there after the 27th ball, if there are exactly 9 blue and 9 yellow balls included up to and including the 27th ball?
- 13
- 21✓
- 32
- 40
Correct answer
1
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