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A baised coin with probability p,0lt p l...

A baised coin with probability p,`0lt p lt` of heads is tossed until a head appears for the first time. If the probability that the number of tosses required is even is 2/5, then p is equal to

A

`(2)/(3)`

B

`(1)/(2)`

C

`(1)/(3)`

D

`(1)/(4)`

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The correct Answer is:
C
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AAKASH SERIES-APPENDICES (REVISION EXERCISE)-Probability
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  10. A number x is chosen at random from the set {1,2,3,4,. . . . ,100} . D...

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  11. Let A and E be two events with positive probabilites Statement 1 :...

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  14. Three dice, red, blue and green in colour are rolled together. Let B ...

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  15. Set A,B,C, A cap B, A cap B, Acap C, B cap C and A cap B cap C have...

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  16. A man is known to speak the truth on an average 3 out of 4 times. He t...

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  17. A class consists of 80 students, 25 of them are girls. If 10 of the s...

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  18. If P(A) = 0 . 4 , P(B')= 0.6 and P(A cap B) = 0 . 15, then the value ...

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  19. Let A and B be two events such that P(A cup B) ge 3//4 and 1//8 le P(...

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  20. A baised coin with probability p,0lt p lt of heads is tossed until a h...

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