How many ways can 10 people sit in a row if no restrictions

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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

Reference no: EM13958025

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