Questions
A bag contains coins. It is known that n of these coins have a head on both sides where as the rest of the coins are fair. A coin is picked up at random form the bag and is tossed. If the probability that the results in a head is then the value of n is
detailed solution
Correct option is B
Given, n coins have head on both sides and (n+1) coins are fair coins. Let E1= Event that an unfair coin is selected E2= Event that a fair coin is selected H= Event that the toss result in a head P(H)=PE1⋅PH/E1+PE2⋅PH/E23142=n2n+1⋅1+n+12n+1⋅12 ⇒ n=10Similar Questions
The probabilities of four cricketers A, B, C and D scoring more than 50 runs in a match are
799 666 8865
support@infinitylearn.com
6th Floor, NCC Building, Durgamma Cheruvu Road, Vittal Rao Nagar, HITEC City, Hyderabad, Telangana 500081.
JEE Mock Tests
JEE study guide
JEE Revision Notes
JEE Important Questions
JEE Sample Papers
JEE Previous Year's Papers
NEET previous year’s papers
NEET important questions
NEET sample papers
NEET revision notes
NEET study guide
NEET mock tests