perplexus.info :: Probability : Non-conformist choice

Non-conformist choice (Posted on 2024-03-14)

There are total 21 balls in a bag.
Out of them 7 are blue,
5 are green
and 9 are black.
You pick 4 balls randomly from the bag.

What is the probability that not all balls are of the same colour?

See The Solution Submitted by Ady TZIDON

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% missing in the official solution Comment 4 of 4 |

Solution posted by me: the % sign is missing.
Trying to correct the erroneous last digits in a totally correct process
I have introduced an error 100 times bigger, and uncorrectable.
SORRY

Posted by Ady TZIDON on 2024-03-20 04:48:53

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