Nyatakan dengan menggunakan notasi sigma! dari 2-4+8-16+32-64
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Jawab:
Notasi SIgma
Penjelasan dengan langkah-langkah:
2 - 4 + 8 - 16 + 32 - 64 =
a= 2
r = -4/2 =- 2
Un = a. rⁿ⁻¹
Un = (2) (-2)ⁿ⁻¹
Un = 2. (-2)⁻¹. (-2)ⁿ
Un = 2/(-2) (-2)ⁿ
Un = - ( -2)ⁿ
⁶
∑ -(-2)ⁿ
n =1