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. The twins want to sit next to each other. Danka is always to the right of Janka, and Betka is near one of them. How many may they sit?

Correct answer:

n =  10

Step-by-step explanation:

n=1+2 4+1=10

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