Question
Three coins are tossed together. Write all the possible outcomes. Now, find the probability of getting: at least one tail
✓
Answer
When three coins are tossed, possible outcomes are:
HHH, HHT, HTH,HTT,THH, THT,TTH,TTT
Total possible outcomes $=8$
Favorable outcomes for at least one tails = HHT,THH,HTH,HTT,THT,TTH,TTT
Number of favorable outcomes $=7$
$
P (\text { at least one tail })=\frac{7}{8}
$
HHH, HHT, HTH,HTT,THH, THT,TTH,TTT
Total possible outcomes $=8$
Favorable outcomes for at least one tails = HHT,THH,HTH,HTT,THT,TTH,TTT
Number of favorable outcomes $=7$
$
P (\text { at least one tail })=\frac{7}{8}
$
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