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terimakasih
tolong jadikan solusi terbaik yah
498 = 402 + (n -1)3
96 = (n-1)3
32 = n-1
n = 33
jumlah kliptn 3 antara 400 dan 500 :
s33 = 33/2 (402 + 498) = 33 x 450 = 14850