1234 First, three people answered correctly and five people answered incorrectly: (1/4) 3 * (3/4) 5.

Then consider which three people are right: 3C8.

Therefore: 3c8 * (1/4) 3 * (3/4) 5

The above is done by the high school method.

This should be a binomial distribution in the probability distribution. The probability formula is: p = c (k, n) × p k × (1-p) (n-k). C (k, n) represents the number of combinations, and it will be quick as long as it is substituted.

6-bit probability, 7-bit probability, 8-bit probability, just add them up, all in the above way.