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203 + 210 + ........ +399
a= 203
b= 7
Un= 399
399 = a + (n-1) b
399= 203 + (n-1) 7
399 -203 /7 = n-1
29 = n
skarang mencari jumlah bilangannya.
Sn = n/2 (2a + (n-1) b )
S29 = 29/2 ( 2.203 + 28. 7)
S29 = 8729
semoga bermanfaat :)