A coin is tossed 80 times with following outcomes:Head: 35 times and tail: 45 times.In a single throw of a coin, if E be the event of getting a head, verify that p (E) +P(not E)=1.

Total number times a coin is tossed = 80

Number of times head occurred = 35

Number of times tail occurred = 45

Probability P() =

Probability of getting a tails is P(tail) =

Here P(head) = and P(tail) =

Hence proved.

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