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u7=a+6b =38
*4b=20
b=5
jika b=5 maka a=8
s24= n/2 (2a+(n-1)b
=24/2 (2.8+(23)5)
=12(16+115)
=12(131)
=1572
> substitusikan pers. (1) dan (2)
> cari