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yan [13]
3 years ago
15

the digits 3,4,5,6,7,and 8 are randomly arranged to form a 3 digit number not repeating. find the probability that the number is

even and greater than 800.
Mathematics
1 answer:
nadezda [96]3 years ago
7 0
The answer would be 212,I can't completely explain why because I did it the long way which took me over an hour to do.
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motikmotik

We need to find the product of :

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So, the result as following:

\begin{gathered} \mleft(4y-3\mright)\mleft(2y^2+3y-5\mright) \\ =4y\cdot(2y^2+3y-5)-3\cdot(2y^2+3y-5) \\ =8y^3+12y^2-20y-(6y^2+9y-15) \\ =8y^3+12y^2-20y-6y^2-9y+15 \\  \\ =8y^3+6y^2-29y+15 \end{gathered}

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