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![[Post New]](/templates/default/images/icon_minipost_new.gif) 15 Feb 2008 23:38:30 IST
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explanation :
see in tossing a coin 4 times
u could get 0 or 1 or 2 or 3 or all 4 as tails ......1
atleast 1 tail means either 1 or 2 or 3 or 4
that is expecting 0
now since 1 is exhaustive sum of all probabilities is 1
so it is 1- prob of getting no tail
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