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lenadorzhieva24
@lenadorzhieva24
July 2022
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дана конечная арифметическая прогрессия. найдите n, если а1=-3, d=2, an=21
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sangers1959
Verified answer
A₁=-3 d=2 an=21 n-?
an=a₁+(n-1)*2=21
-3+2n-2=21
2n=26
n=13.
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Answers & Comments
Verified answer
A₁=-3 d=2 an=21 n-?an=a₁+(n-1)*2=21
-3+2n-2=21
2n=26
n=13.