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Verified answer
Bab : Barisan dan deretaritmatika
rumus :
b =
Un = a + (n-1) b
U9 = a + (9-1) 2
23 = a + 8.2
a = 23 - 16
a = 7
maka jumlah 25 suku pertama yaitu
Sn =
jadi jumlah 25 suku pertama yaitu 775