Question

The probability that an event A happens in one trial of an experiment is 0.4. Three independent trials of the experiment are formed. The probability that the event A happen at least once is

• A. 0.936
• B. 0.784
• C. 0.904
• D. None of these

Answer 1

Answer: (B)

0.784

Answer 2

Required probability = 1 – {P( $\overline { \mathrm { A } }$ )}³

= 1 – (0.6)³ = 0.784