Why is Head taking time to come?
Probability
Level
2
A fair coin is tossed in fite number of times. The probability that a
head turns up for the first time after even number of tosses is
2/3
1/3
3/4
1/2
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1 solution
Head occurs for first time after even no of tosses it becomes a gp of first term 1/4 and common ratio 1/4 applying sum of infinite series of gp we get (1/4)/1-(1/4)=1/3