If three coins are flipped. what is the propability of obtaining atleast one head.

Step-by-step explanation:

We are give that three coins are flipped

Then , the sample space={HHH,HHT,THH,HTH,TTH,HTT,THT,TTT}

We have to find the probability of obtaining atleast one head

Atleas one head it means equal 1 or more than 1 head

Favorable cases={HHH,HHT,THH,HTT,HTH,TTH,THT}

Total number of cases=8

Number of favorable cases=7

Probability,P(E)=

Using  the formula

The probability of obtaining atleast one head=

it is true

step-by-step explanation:

all the combinations add up i used   calculator

0.02

step-by-step explanation:

time of 9 192 631 770 periods of the radiation corresponding to the transition between the 2 hyperfine levels of the ground state of the caesium 133 atom at 0 k (but other seconds are sometimes used in astronomy)