1985 AHSME Problems/Problem 24
Problem
A non-zero digit is chosen in such a way that the probability of choosing digit is . The probability that the digit is chosen is exactly the probability that the digit chosen is in the set
Solution
Notice that . Therefore, the probability of choosing is . The probability that the digit is chosen out of the set is twice that, .
which is the probability that the digit is from the set .
See Also
1985 AHSME (Problems • Answer Key • Resources) | ||
Preceded by Problem 23 |
Followed by Problem 25 | |
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