1. Diketahui :
a = 5
b = 9
Ditanya:
U40 = ?
Jawab :
Un = a + (n-1) b
U40 = 5 + (40-1) 9
= 5 + 39.9
= 5 + 351
= 356
2. Diketahui :
a = 3
b = 5
Ditanya :
Sn = 15
Sn = n/2 (2a + (n-1) b)
S15 = 15/2 (2.3 + (15-1) 5)
= 15/2 (6 + 14.5)
= 15/2 (6 + 70)
= 15/2 . 76
= 570
3. Rasio= 2
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1. Diketahui :
a = 5
b = 9
Ditanya:
U40 = ?
Jawab :
Un = a + (n-1) b
U40 = 5 + (40-1) 9
= 5 + 39.9
= 5 + 351
= 356
2. Diketahui :
a = 3
b = 5
Ditanya :
Sn = 15
Jawab :
Sn = n/2 (2a + (n-1) b)
S15 = 15/2 (2.3 + (15-1) 5)
= 15/2 (6 + 14.5)
= 15/2 (6 + 70)
= 15/2 . 76
= 570
3. Rasio= 2