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Kelas IX
a = 402
Un = 498
b = 3
Un = a+(n-1)b
498 = 402 + 3n - 3
3n = 99
n = 33
Sn = n/2 (a+Un)
S33 = 33/2 (402+498)
S33 = 14.850
Kelas : IX SMP
Bab : Barisan dan Deret
Pembahasan :
402 , 405 , 408 , ... 498
Un = 498
a + (n - 1)b = 498
402 + 3n - 3 = 498
3n + 399 = 498
3n = 99
n = 33
Maka...
Sn = n/2(2a + (n - 1)b)
S33 = 33/2(2.402 + 32.3)
S33 = 33/2(804 + 96)
S33 = 33/2(900)
S33 = 14.850