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Probability — Mathematics STD 10 — Question

ICSE BoardEnglish MediumSTD 10MathematicsProbability2 Marks
Question
Three coins are tossed together. Write all the possible outcomes. Now, find the probability of getting: at most two heads
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Answer

When three coins are tossed, possible outcomes are:
HHH,HHT,HTH,HTT,THH,THT,TTH,TTT
Total possible outcomes=8
Favourable outcomes for at most two heads=HHT,THH,HTH,HTT,THT,TTH,TTT
Number of favoraable outcomes=7
p(at most two heads)=$\frac{7}{8}$

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