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b = 2
maka
sn = n/ 2 (2a + (n-1)b)
s15 = 15/2 (2.10 +(15-1)2)
s 15 = 7,5 ( 20 + 14.2)
s15 = 7,5 ( 20 + 28)
s15 = 7,5 x 48
s15 = 360 kursi
dibarisan pertama terdapat 10 kursi
dibarisan 2-15 = seterusnya bertambah 2
dit: jumlah keseluruhan kursi................?
peny:
15 + 17 + 19 + 21 + 23 + 25 + 27 + 29 + 31 + 33 + 35 + 37 + 39 + 41 + 43
= 435
jadi jumlah seluruh kursi = 435