Penjelasan dengan langkah-langkah:
19, 17, 15, 13, ...
suku pertama (a) = 19
beda (b) = -2
suku ke-20
U20 = a + 19b
U20 = 19 + 19 (-2)
U20 = -19
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Penjelasan dengan langkah-langkah:
19, 17, 15, 13, ...
suku pertama (a) = 19
beda (b) = -2
suku ke-20
U20 = a + 19b
U20 = 19 + 19 (-2)
U20 = -19