Запишите последовательность из пяти чисел, в которой первое число равно 1, а каждое следующее — на 2/3 больше предыдущего. Найдите сумму членов этой последовательности.

1. Pushkin is a great singer, isn't he?
2. They aren’t going to play football today, are they?
3. The girl is reading a book, isn't she?
4. Children mustn’t open their textbooks, must they?
5. I am in Pobeda Street, aren't I?
6. The woman isn't in the park, is she?
7. Masha can play tennis, can't she?
8. You don't have a brother, do you?
9. Your mother doesn't speak French, does she?
10. We like to play basketball, don't we?
11. Her father works in a hospital, doesn't he?
12. Rob has a pet Nessie, doesn't he?

1 isn't she? 2 they are? 3 isn't she? 4 must they? 5 doesn't I? 6 is she? 7 can't she? 8 do you? 9 does she? 10 doesn't we? 11 doesn't them? 12 hasn't he?