Jawaban:
n = 10
U1 = a = 5
b = 15 – 5 = 25 – 15 = 10
Sn = (2a + (n-1) b )
S10 = ( 2.5 + (10 -1) 10)
= 5 ( 10 + 9.10)
= 5 . 100 = 500
Suatu deret aritmatika 5,15,25,35...
Berapakah jumlah 10 suku pertama dari deret aritmatika di atas?
maka,
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Jawaban:
n = 10
U1 = a = 5
b = 15 – 5 = 25 – 15 = 10
Sn = (2a + (n-1) b )
S10 = ( 2.5 + (10 -1) 10)
= 5 ( 10 + 9.10)
= 5 . 100 = 500
Pembahasan :
Diketahui :
Suatu deret aritmatika 5,15,25,35...
Ditanya :
Berapakah jumlah 10 suku pertama dari deret aritmatika di atas?
_____________________________
Penyelesaian :
maka,
_____________________________