IIT JEE , AIEEE Forum - Mathematics , Algebra - 2 doubts in probablity . rates assured !! par answer toh kaarooo

sweetgal17

question 1

five cards are drawn successively with replacement from a well shuffled deck of 52 cards. what is the prob of

1.all five cards are spades

2. only 3 cards are spades

question 2

a coin is biased so tht the head is 3 times as likley to occur as tail. if the coin is tossed twice find the probabilty distribution of number of tails !!

i will rate u for sure eeven if u answer 1 !!

see i m so good .. now pls help me ;-))

yuiop

13c5/52c5 is the probability of all 5 spades

yuiop

13c3*39c2/52c5 is probability of exactly 3 spades

2tails : 1/16

1tail:6/16

0tails:9/16

spideyunlimited

Q1) 1) (13/52)*(13/52)*(13/52)*(13/52)*(13/52) = 1/1024

sweetgal17

yaar solve toh karo .. tell me the answer .. !!
okay heres the answer
q1, 1/1024

sweetgal17

thansk spidey;-)

sweetgal17

q2 is
when x=0 then p(x)= 9/16
when x=1 then p(x)=6/16
when x=2 then p(x)=1/16

akhil_o

prob for a head- 3/4 and tail-1/4

so for
tail=0, we have (3/4)(3/4)=9/16
tail=1, 2C1(3/4)(1/4)=2*3/16=3/8
tail=2, (1/4)(1/4)-1/16

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