A radioactive substance decays according to the equation y=30( .88 )^x, where y is measured in grams of the radioactive substanc
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The first digit may be 1 or 8.
The second digit may be 1, 2, 4, 8.
The third digit may be 1, 3, 5, 7, 9.
There are
The probability that this is the correct code is