Question

What is the probability of getting at least one tail, when two coins are tossed simultaneously

Answer 1

When two coins are tossed simultaneously, the total outcomes would be as :-

(tail,tail) ; (tail,head) ; (head,tail) and (head,head)

So, $\boxed{\bf{Total\:no\:of\:outcomes\:=\:4}}$

Favourable outcomes (at least one tail) = (tail,tail) ; (tail,head) and (head,tail)

$\boxed{ \bf{favourable \: outcomes = 3}}$


$\underline{ \bf{probability(at \: least \: one \: tail \: ) }} \: \\ \\ \boxed{ \bf{ = \frac{favourable \: outcomes}{total \: number \: of \: outcomes} }}$


$= \bf{ \frac{3}{4} }$

or $\bf{0.75}$

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$\boxed{ \bf{Note }}$


Probability can never be smaller than 0 .

It can also never be greater than 1 .