deret aritmatika
b = u2 - u1 = 23-13 = 10
a = 13
Un = 13 + (n-1)10
153 = 13 + 10 n - 10
153-3 = 10n
150 = 10n
n = 15
S15 = ½ x 15 ( 13 + 153)
= ½ x 15 x 166
= 1245
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deret aritmatika
b = u2 - u1 = 23-13 = 10
a = 13
Un = 13 + (n-1)10
153 = 13 + 10 n - 10
153-3 = 10n
150 = 10n
n = 15
S15 = ½ x 15 ( 13 + 153)
= ½ x 15 x 166
= 1245