The letters ABCDEFGH are to be used to form strings of length four
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The letters ABCDEFGH are to be used to form strings of length four.How many strings contain the letter A if repetitions are not allowed?
An exam has 12 problems. How many ways can (integer) points be assigned to the problems if the total of the points is 100 and each problem is worth at least five points?
How many different strings can be made from the letters in SALES- PERSONS, using all the letters, if no two S's are consecutive?
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