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Un : 498
cari n!
un : a+bn-b
498 : 402 + 3n - 3
96 : 3n - 3
99 : 3n
n : 33
cari S33!
s33 : 33/2 (a + u33)
= 33/2 x 900
= 33 x 450
= 14850
apa bila salah hitung, maklumi yaa
semoga membantu selamat belajar!