Penjelasan dengan langkah-langkah:
a = -2
b = 3 - (-2) = 5
------------------------
Sn = n/2·(2a + (n - 1)b
S20 = 20/2·(2·(-2) + (20 - 1)·5)
S20 = 10·((-4) + 19·5)
S20 = 10·91
S20 = 910
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Penjelasan dengan langkah-langkah:
a = -2
b = 3 - (-2) = 5
------------------------
Sn = n/2·(2a + (n - 1)b
S20 = 20/2·(2·(-2) + (20 - 1)·5)
S20 = 10·((-4) + 19·5)
S20 = 10·91
S20 = 910