<PRE><B>Question 149492</B>
If three coins are tossed. Find the probability that no more than one coin lands heads up. Is it 5/8. 1/4, 3/8, or 1/2 

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P(0 or 1 heads in 3 tosses) = P(no heads) + P(1 head) 
= (1/2)^3 + 3C1(1/2)^1*(1/2)^2 

= (1/8) + 3*(1/8) = 4/8 = 1/2
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