Practice variation 2 of 3
Binomial distribution — At least one success
Your question
A trial succeeds with probability . For five independent trials, find the probability of at least one success.
This practice question was inspired by Question 13(d) in the 2025 NSW HSC Mathematics Extension 1 examination, © NESA. It is an original TestMum variation that practises the same mathematical idea, not an official NESA question.
Before you check
- Have you stated every choice or assumption?
- Can another student follow each line?
- Did you verify the final result independently?