﻿ A bag contains n + 1 coins. It is known that one of these coins shows heads on both sides, whereas the other coins are fair. One coin is selected at random and tossed. If the probability that toss results in heads is 7/12, then the value of n is : Kaysons Education

A Bag Contains n + 1 Coins. It Is Known That One Of These Coins Shows Heads On Both Sides, Whereas The Other Coins Are Fair. One Coin Is Selected At Random And Tossed. If The Probability That Toss Results In Heads Is 7/12, Then The Value Of n is

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Question

Solution

Correct option is

5

Let E1, denote the event a coin with two heads is selected and E2, denote the event a fair coin is selected. Let A be the event the toss results in heads. Then

⇒           12 + 6n = 7n + 7   ⇒   n = 5.

SIMILAR QUESTIONS

Q1

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has

Q2

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Q5

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Q6

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Q7

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Q8

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Q9

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Q10

In a game, a person is paid Rs. 5 if he gets all heats or all tails when three coin are tossed, and he will pay Rs. 3 if either one or two heads shown. What can be expect to win on the average per game?