Question

Tolong dikerjakan no 3-5 pake jalan caranya besok dikumpul jgn sembarang jgn pake maaf kalo salah

Answer 1

Verified answer

4. Bilangan pertama = 40
Beda = 6
Sn = n/2 × [2a + (n-1) × b]
S15 = 15/2 × [2×40 + (15-1) × 6]
= 15/2 × [80 + 84]
= 15/2 × 164
= 15 × 164 / 2
= 2.460 / 2
= 1.230
5. Rasio = Bilangan ke-2 - Bilangan ke-1
= 192 / 768 = ¼ (A)