Даю 30 баллов кто поможет.

1) an - арифметическая прогрессия
a1 = 3 , d = 2. Найти a7, a35, s7, s20.

2) 7,3,1... - арифметическая прогрессия
Найти a, d, a14, s8.

3) Найти s10, если a1 = 6, a13 = 42.
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