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a= 402
b = 3
Un = a+ (n-1)b=498
402+(n-1)3=498
402+3n-3=498
399+ 3n= 498
3n= 498-399 = 99
n= 99/3=33
S33=n/2(2a+(n-1)b)
= 33/2 (2.402+(33-1)3)
=33/2(804+32.3)
= 33/2(804+96)
=33/2. 900
=14850
klo ada yg salah hitung maaf y...dicek lgi aja.....