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b = U2 - u1 = 105 - 102 = 3
Maka,
Un = a + (n -1)b
297 = 102 + (n - 1)3
= 102 + 3n - 3
= 99 + 3n
297 - 99 = 3n
198 = 3n
198/3 = n
66 = n
Maka,
S66 = n/2 (a + Un)
= 66/2 (102 + 297)
= 33 . 399
S66 = 13.167
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