Question

if three coins tossed at a time find the probability of
a) atleast one head
b)atmost one head

Answer 1

3 by 9 is the answer of 1

Answer 2

sample space ={hhh,ttt,htt,thh,hth,tht,tth,hht}
                     n(s)=8
             a)   A={hhh,htt,thh,hth,tht,tth,hht}
                    N(A)=7
                   p(a)=n(a)/n(s)=7/8
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