get SAT Test. In Exercises 15-20, assume that random guesses are made for eight multiple choice questions on an SAT test, so that there are n = 8 trials, each with probability of uccess (correct) given by p = 0.20. Find the indicated probability for the number of correct answers. 15. Find the probability that the number x of correct answers is exactly 7. 16. Find the probability that the number x of correct answers is at least 4. 17. Find the probability that the number x of correct answers is fewer than 3. 100 18. Find the probability that the numberx of correct answers is no more than 2. 19. Find the probability of no correct answers. 4. 20. Find the probability that at least one answer is correct. , aalaatad 540

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Permutations and Combinations

If there are 5 dishes, they can be relished in any order at a time. In permutation, it should be in a particular order. In combination, the order does not matter. Take 3 letters a, b, and c. The possible ways of pairing any two letters are ab, bc, ac, ba, cb and ca. It is in a particular order. So, this can be called the permutation of a, b, and c. But if the order does not matter then ab is the same as ba. Similarly, bc is the same as cb and ac is the same as ca. Here the list has ab, bc, and ac alone. This can be called the combination of a, b, and c.

Counting Theory

The fundamental counting principle is a rule that is used to count the total number of possible outcomes in a given situation.