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A bag contains n+1 coins. If is known th...

A bag contains `n+1` coins. If 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 find the value of `ndot`

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The correct Answer is:
`(5)`
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Knowledge Check

  • 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.

    A
    3
    B
    4
    C
    5
    D
    none of these

  • A bag contains (2n + 1) coins. It is known that n of these coins have a head on both sides, whereas the remaining (n + 1) coins are fair. A coin is picked up at random from the bag and tossed. If the probability that the toss results in a head is 31/42, then n is equal to

    A
    10
    B
    11
    C
    12
    D
    13

  • A bag contains 16 coins of which 2 coins are counterfeit with heads on the both sides. The rest are fair coins. One is selected at random from the bag and tossed. The probability of getting a head is :

    A
    a. `3/16`
    B
    b. `13/16`
    C
    c. `9/16`
    D
    d. `7/16`

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