Determine the probability P,for each of the following events.Atleast one head in two tosses of a fair coin.

Question

$\begin{array}{1 1}(A)\;\large\frac{3}{4}\\(B)\;\large\frac{2}{5}\\(C)\;\large\frac{3}{7}\\(D)\;\large\frac{4}{5}\end{array}$