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b = -13 - ( - 19) = 6----> ini yg salah...bukan negatif, tapi positif
S50 = n/2 (2a + (n-1)b)
= 50/2 ( 2.-19 + (50 - 1) 6)
= 25 . ( -38 + 294)
= 25 . 256
= 6400
S50 =
S50 = 275
tolong koreksi jika ada kesalahaan ya..
Note ** : nilai beda(b) sebenarnya 0,5sekian.., namun saya bulatkan ke 1