Penjelasan dengan langkah-langkah:
U5 = a + 4b = 13
U13=a + 12b = 29
- 8b = - 16
b = 2
a + 4(2) = 13
a = 13 - 8
a = 5
s25 = 25/2 (10 + 24(2) = 725
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Penjelasan dengan langkah-langkah:
U5 = a + 4b = 13
U13=a + 12b = 29
- 8b = - 16
b = 2
a + 4(2) = 13
a = 13 - 8
a = 5
s25 = 25/2 (10 + 24(2) = 725