Question

10.A coin is tossed three times. Then the probability that at least one tail occurs is *
7/8
1/8
3/4
None of these​

Answer 1

Answer:

when a coin is tossed three times , then the total no. of outcome is $2^{n}$.

where n is the no. of times the coin is tossed ...

here total no. of outcomes is $2^{3}$ = 8 outcomes...

then the sample space will be:

TTT    TTH     THH   HHH

HTT    HHT   HTH    THT

atleast one tail means there can be one or more than one times occurence of tail....

now prbablity = favourable outcome / total outcome

                       = 7/8