Jawaban:
deret aritmatika
beda = 74 - 68 = 6.
a = 68
Sn = ½n(2a+(n-1)b
S15 = ½15 (2(68) + (15 - 1)6
S15 = ½15 (136 + 14(6))
S15 = ½15 (136 + 84)
S15 = 15.220/2
S15 = 3.300/2
S15 = 1.650
b = 74 - 68
b = 6
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Jawaban:
deret aritmatika
beda = 74 - 68 = 6.
a = 68
Sn = ½n(2a+(n-1)b
S15 = ½15 (2(68) + (15 - 1)6
S15 = ½15 (136 + 14(6))
S15 = ½15 (136 + 84)
S15 = 15.220/2
S15 = 3.300/2
S15 = 1.650
Pembahasan:
Diketahui :
a = 68
b = 74 - 68
b = 6
Ditanya:
maka, Jumlahnya 15 suku pertama adalah?
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