Kakak saya minya tolong ya Dari no. 1 sampai 5

4. 3,5,7,...
a = 3 dan b = 2
Un = a + (n - 1)b
U10 = 3 + 9(2) = 3 + 18 = 21

5.
15,24,35,48,63,...
di mana a = 15
15 → 24 = beda = 9 ← b awal
24 → 35 = beda = 11
* 9 → 11 = beda (c) = 2

Un = a + (n - 1)b + (n - 1)(n - 2)c/2
U14 = 15 + 13(9) + (13)(12)2/2
U14 = 15 + 117+ 156
U14 = 132 + 156
U14 = 288

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