Yusufatlgnrans
Answered

İlk terimi 2 ve ortak farkı 3 olan bir aritmetik dizisinin ilk 15 teriminin toplamı kaçtır​

Sagot :

Kursatsari1976rans

Cevap:

345

Adım adım açıklama:

an= a1+(n-1).d

a15= 2+14.3= 44

ilk n teriminin toplami

Sn= n/2(a1+a15)

Sn= 15/2(2+44)= 690/2= 345

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