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1. In how many ways can 10 people sit in a row if
a. there are no restrictions
b. persons A and B must sit next to each other
c. there are 4 men and 6 women and the 4 men must sit next to each other
d. there are 5 sets of twins and each set of twins must sit together
e. there are 5 men and 5 women and no 2 men or 2 women can sit next to each other

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The problems that are from probability class are determined. The introductory course on probability are given.

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1. In how many ways can 10 people sit in a row if
a. there are no restrictions
b. persons A and B must sit next to each other
c. there are 4 men and 6 women and the 4 men must sit next to each other
d. there are 5 sets of twins and each set of twins must sit together
e. there are 5 men and 5 women and no 2 men or 2 women can sit next to each other
Sol:
(a) The first seat can be filled by any of the 10 persons, the second by any of the remaining 9, the third by any of ...

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