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July 31, 2015

Homework Help: MATH 157

Posted by Rayna on Wednesday, August 4, 2010 at 12:46am.

Can anyone please help me understand these math problems.
#4. How many three-symbol codes (letter-number-number)can be made from the letters S, P, Y, and two-digits from the set of (0, 1, 2,..., 9) without repetition?
#16. A pair of dice are rolled and the sum on their upturned faces is recorded. What is the probability that the sum showing is 8, given that one die is showing a 5?
#20. A box contains two black balls and three gold balls. Two balls are randomly drawn in succession fro the box. a.) If there is no replacement, what is the probability that both balls are black? b) If there is replacement before the second draw, what is the probability that both balls are blacks?
#26. Jack is taking a four-item true-false test. He has no knowledge about the subject of the test and decides to flip a coin to answer the items. What is the probability that he receives a perfect score? What is the probability on a 10-item test?
Please help me.

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