JAMB - Mathematics (1985 - No. 28)
If two fair coins are tossed, what is the probability of getting at least one head?
\(\frac{1}{4}\)
\(\frac{1}{2}\)
1
\(\frac{43}{78}\)
\(\frac{3}{4}\)
설명
Prob. of getting at least one head
Prob. of getting one head + prob. of getting 2 heads
= \(\frac{1}{4}\) + \(\frac{2}{4}\)
= \(\frac{3}{4}\)
Prob. of getting one head + prob. of getting 2 heads
= \(\frac{1}{4}\) + \(\frac{2}{4}\)
= \(\frac{3}{4}\)