Answer:
P(A) = 3/10
P(B) = 7/30
P(A and B) = 2/15
P(A/B) = 4/7
No P(A/B) ≠ P(A)
No, events A and B are not independent events.
x= A ticket
y=b ticket
x+y=500
10x+60y=6000
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10x+60y=6000
- x+y=500 (*10) ---> 10x+10y=5000
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10x+60y=6000
- 10x+10y=5000
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50y=1000
y=1000/50
y=20
b ticket =20
x+y=500
x+20=500
x=500-20
x=480
a ticket=480
answer is the last option ,
B=kt
constant is k
b=0.25t
constant of proprtionality is 0.25