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Verified answer
Diket : sn = 7052n = 41
b= 8
ditanya : a ( suku pertama).......?
jawab:
sn = n/2 (2a+(n-1)b)
7052 = 41/2 (2a +(41-1)8)
7052 = 41/2 ( 2a + 40 x8)
7052 = 20.5 ( 2a + 320)
7052 = 41a + 6560
41a = 7052-6560
41a = 492
a= 492/41
a= 12
keterangan : sn = jumlah suku
a= suku pertama
n= banyak suku
b= beda
semoga bermanfaat