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iloveayau
@iloveayau
July 2022
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a1=429
d=-22
S(n)=3069
n-?
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anastasiatsilimpiou
A1=429
d=-22
Sn=-3096.
Sn=(2a1-d(n-1))n/2.
-3096=(2*429+22(n-1))n/2.
n = 239
1 votes
Thanks 1
iloveayau
3069 + же а не -
iloveayau
3069 + же , а не -
anastasiatsilimpiou
ой сейчас погоди
iloveayau
А что если d=22 получиться?
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Answers & Comments
d=-22
Sn=-3096.
Sn=(2a1-d(n-1))n/2.
-3096=(2*429+22(n-1))n/2. n = 239