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b. 6
Un = 294
Un = 102 + (n-1)6
Un = 102 +6n - 6
102 = 6n + 96
Un = 6n + 96
294 = 6n + 96
6n = 294-96 = 198
n = 198/6 = 33
maka
S33 = 33/2 (102+294) = 16,5 x 396 = 6534 maaf kalo salah..
= 102,108,114,...,288,294
Un=a +(n-1)b
294 = 102 +6(n-1)
192= 6(n-1)
192/6 = n-1
32 = n-1
n = 33
S33 = n/2 x (a + Un)
= 33/2 x (102+294)
= 33/2 x 396
= 33 x 396
2
= 33 x 198
= 6534