Qualification > Math

S1 and S2 DOUBTS HERE!!!!

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solo_G:

--- Quote from: immortal on May 21, 2010, 08:05:23 am ---###***
26C1=26(choosing da last remaining letter)
10C1*10C1=100(choosing both digits,dey cn b repeated)
26*100=2600

--- End quote ---
aye aye i see...thanks immortal!
+1 rep! ;D

immortal:
U're welcome :)

Freaked12:

--- Quote from: solo_G on May 21, 2010, 04:04:18 am ---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  ;D

--- End quote ---

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.. 

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