Dari barisan aritmetika diketahui U3 = 18 dan U7 = 38. Jumlah 24 suku pertama adalah..
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u7...... a + 6b = 38 -
-4b = - 20
b = 5
a + 2b = 18
a = 18 - 2b = 18 - 2*5
a = 18 - 10 = 8
u24 = a + 23b = 8 + 23*5= 123
S24 = 1/2n ( a + u24)
= 1/2*24 ( 8 + 123)
= 12 (131)
= 1.572