U5 = a+(5-1)b = 15
U10 = a+(10-1)b = 30
_______________—
-5b = -15
b = 3
U5 = a+(5-1)3 = 15
a+12 = 15
a = 3
U30 = a+(n-1)b
3+(29)3
= 90
S30 = n/2 (a+Un)
30/2 (3+90)
= 1395
Ket :
Un = suku ke-n
Sn = jumlah suku ke-n
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U5 = a+(5-1)b = 15
U10 = a+(10-1)b = 30
_______________—
-5b = -15
b = 3
U5 = a+(5-1)3 = 15
a+12 = 15
a = 3
U30 = a+(n-1)b
3+(29)3
= 90
S30 = n/2 (a+Un)
30/2 (3+90)
= 1395
Ket :
Un = suku ke-n
Sn = jumlah suku ke-n