kelipatan 2dan3 antara 300=300dan300,kelipatan 2dan3 antara 400=400 dan 499
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kelipatan 2dan3 antara 300=300dan300,kelipatan 2dan3 antara 400=400 dan 499
Un=a+(n-1)b
288=204+(n-1)12
288=12n+192
12n=96
n=8
Sn=n_2(U1+U2)
S8=8_2(204+288)
=1968
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