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a = 153
Un = 297
b = 3
jawab
Un = a+(n-1)b
297 = 153 + (n-1)3
297-153 = 3n-3
144 = 3n-3
144+3 = 3n
147 = 3n
147/3 = n
49 = n
Sn = n/2 (a+Un)
Sn = 49/2 (153+297)
Sn = 11025
Jadi, jumlah kelipatan 3 diantara 150 dan 300 adalah 11025