tolong dikerjakan yg bener jgn maaf kalo salah melulu besok dikumpul no1-3 pake cara jalan hitung

2. Beda = 7 - (-2) = 9
Suku selanjutnya ↓
# 25 + 9 = < 34 >
# 34 + 9 = < 43 >
# 43 + 9 = < 52 >
Jadi, C. 34, 43, dan 52
3. Bilangan pertama = 1
Beda = 1
Un = n/2 × [2a + (n-1) × b]
U49 = 49/2 × [2×1 + (49-1) × 1]
= 49/2 × [2 + 48]
= 49 × 50 / 2
= 2450 / 2
= 1225 (A)