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the sample space of toss 2 coins and a fair coin simultaneously:
s:{HHHHHHH,HHHHHHT,HHHHHTT,HHHHHTT,HHHTTTT,HHTTTTT,HTTTTTT,TTTTTTT}
n(s):
let A be the event getting at least one tail
A:{HHHHHHT,HHHHHTT,HHHHHTT,HHHTTTT,HHTTTTT,HTTTTTT,TTTTTTT}
n(A):7
p(A):n(A)/n(s)=7/8
Therefore the probability of getting at least one tail is 7/8