We know that,
Probability of occurrence of an event
= \(\frac{Total\,no.of\,Desired\,outcomes}{Total\,no.of\,outcomes}\)
Let B be Boy and G be Girl
Total possible outcomes are BB, BG, GB, GG
Our desired outcome is at least one boy. So, BB, BG, GB are desired outputs.
Total no. of outcomes are 4, and the desired outcomes are 3
Therefore, the probability of at least one boy = \(\frac{3}{4}\)
Conclusion: Probability of at least one boy is \(\frac{3}{4}\)