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Kelas IX
b= 4
a = 204
Un = 396
Un = a+(n-1)b
396 = 204 + 4n - 4
n = 49
Sn = n/2 (a+Un)
S49 = 49/2 x 600
S49 = 14.700
Kelas : IX SMP
Bab : Barisan dan Deret
Pembahasan :
204 , 208 , 212 , ... 396
Un = 396
a + (n - 1)b = 396
204 + 4n - 4 = 396
4n + 200 = 396
4n = 196
n = 49
Maka...
Sn = n/2(2a + (n - 1)b)
S49 = 49/2(2.204 + 48.4)
S49 = 49/2(408 + 192)
S49 = 49/2(600)
S49 = 14.700