A=
AP=<e><f>V22:V15</f></e>
C0=
C1=
C2=
C3=
C4=
C5=
C6=
C7=
C8=
C9=
ES=Answers may vary.
F0=
F1=
F2=
H=$.hint$
INST=
M1=
M2=
M3=
M4=
M5=
M6=
M7=
M8=
M9=
MS=1
MW1=
MW2=
MW3=
MW4=
MW5=
MW6=
MW7=
MW8=
MW9=
N=
Q=An urn contains V1 white balls and V2 black balls.<br> Two balls are drawn at random from this urn.<br> Find the probability that V4. Give your answer as a fraction.<br>
SA=Answers may vary.
T=P
TF=-1
TL=
TOL=+1E-4
U=NOUNIT
V0=S"<i>C</i>"
V1=I[2,9]
V10=I(V1-1)
V11=I(V2-1)
V12=I(V1*V10)
V13=I(V2*V11)
V14=I(V6-1)
V15=I(V6*V14)
V16=E"edfrac('v13','v15','im,yB')"
V17=S"V0(V1, 1)"
V18=S"V0(V1, 1)"
V19=I(V1*V2*2)
V2=I[2,9:V1]
V20=E"edfrac('v19','v15','im,yB')"
V21=L[V3:V9,V16,V20]
V22=L[V3:V12,V13,V19]
V3=I[1,3]
V4=L[v3:both balls are white, both balls are black, 1 ball is white and the other is black]
V5=L[V3:V7, V8, V17V18]
V6=I(V1+V2)
V7=S"V0(V1, 2)"
V8=S"V0(V2, 2)"
V9=E"edfrac('v12','v15','im,yB')"
W=<step><frac>V5:V0(V6, 2)</frac> = V21</step>\n<step></step>\n<step></step>\n<step></step>
YN=-1
cnum=4
followup=
ilev=0
mcdm=1
mdm=0
mpc=unspecified
mpn=2
mpv=2.0
mwnum=2
ncd=-1
subject=unspecified
varnum=27
commentV1=    //white ball
commentV2=    //black ball