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 if a fair coin is tossed 8 times, find the probability of getting 1. exactly 3 heads 
2.atleast 3 heads 3. atmost 3 heads

Dear Student ,
 
Please find below the solution to the asked query :

Assuming that coin is tossed 3 timesThen number of possible outcomes are 8HHH , HHT , HTH , HTT , THH , THT , TTH , TTT1 Exactly 3 heads :HHHNumber of favourable outcomes=1P Exactly 3 heads=Number of favourable outcomesTotal number of outcomes=182 Atleast 3 headsHHHP Atleast 3 heads=Number of favourable outcomesTotal number of outcomes=183 Atmost 3 heads:HHH , HHT , HTH , HTT , THH , THT , TTH , TTTP Atmost 3 heads=Number of favourable outcomesTotal number of outcomes=88=1
 
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I think it is not 8 is it 3
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Tell that the head is gain 1 ya 2 times
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