S1 and S2 DOUBTS HERE!!!!

[immortal]

Da MS smetimes tends 2 b wrong.

[Saladin]

same as ur method

but at the end u have to subtract

oops, forgot that part. heheheh.

[solo_G]

okay guys i have a doubt....
of the customers visiting the stereo section of a large electronic store 75% on average make a purchase....find the least possible number of customers, given that the probability of all customers making a purchase is less than 5%
thanks in advance 

[solo_G]

ehm ehm one more doubt
A license plate has 3 letters and 3 digits in that order.A witness to a hit and run accident saw the first 2 letters and the last digit.If the letters and digits can be repeated,how many license plate should be checked before finding the culprit?
ANS: 2600

Thanks again

[immortal]

ehm ehm one more doubt
A license plate has 3 letters and 3 digits in that order.A witness to a hit and run accident saw the first 2 letters and the last digit.If the letters and digits can be repeated,how many license plate should be checked before finding the culprit?
ANS: 2600

Thanks again

###***
26C1=26(choosing da last remaining letter)
10C1*10C1=100(choosing both digits,dey cn b repeated)
26*100=2600

[solo_G]

###***
26C1=26(choosing da last remaining letter)
10C1*10C1=100(choosing both digits,dey cn b repeated)
26*100=2600

aye aye i see...thanks immortal!
+1 rep!

[immortal]

U're welcome

[Freaked12]

okay guys i have a doubt....
of the customers visiting the stereo section of a large electronic store 75% on average make a purchase....find the least possible number of customers, given that the probability of all customers making a purchase is less than 5%
thanks in advance 

P(x=n)<0.05
= (0.75)^n<0.05

take log on both sides
log(0.75)^n<log(0.05)
nlog(0.75)<log(0.05)
n(-0.28768)<-2.99573
when we convert negative to positive the inequality reverses
n>2.99573/0.28768
n>10.4134
n>11

[Freaked12]

I have doubt ladies and gentlemen

November 2003 paper 6
Question 4 part 3

[immortal]

19/20*19/20*1/20

Da first & second card cn b any expect da 1 he wants
da third one he gets da one he wants...afterward it does not matter.. 

[Freaked12]

19/20*19/20*1/20

Da first & second card cn b any expect da 1 he wants
da third one he gets da one he wants...afterward it does not matter.. 

I thought of the same after i got my first answer wrong

I was confused because he bought a total of 5 cards right

so couldnt it be 3C1(19/20)^2(1/20) as he stopped looking at cards after the third one?

[immortal]

I thought of the same after i got my first answer wrong

I was confused because he bought a total of 5 cards right

so couldnt it be 3C1(19/20)^2(1/20) as he stopped looking at cards after the third one?

I advice u 2 think simple

[Freaked12]

I advice u 2 think simple

lol
right

[Blizz_rb93]

What's the formula booklet that the edexcel board will give us during the examination?? or did they stop doing that??

[Saladin]

What's the formula booklet that the edexcel board will give us during the examination?? or did they stop doing that??

i will post it soon

and yes you will be given it