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= 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