Question

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

Answer 1

`(7)/(8)`

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)=
`(Number\;of\;favorable\;cases)/(Total\;number\;of \;cases)`

Using the formula

The probability of obtaining atleast one head=
`(7)/(8)`