The Big Lottery has 49 numbers: 01~49. For each ticket, one can choose 6 different
numbers among 49 numbers. To win the first prize needs to match all 6 numbers. Find
the closest value of the probability to win the first prize.
A straight line.
A circle.
An ellipse.
A spiral line.
A parabola.
Solve exdx − ydy = 0 ; y(0) = 1 .
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