Twins with friend

The twins Danka and Janka went to the cinema with their friend Betka. Only six seats in the second row were available in the cinema. How many do they may sit, if the twins want to sit next to each other, Danka always to the right of Janka and Betka near one of them?

Correct result:

n =  10

Solution:

n=1+2 4+1=10



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