Diketahui suatu barisan -12, -7, -2, m, 8, 13, n, 23, 28 .... Hasil m + n adalah....
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Jawab:
Penjelasan dengan langkah-langkah:
-12, -7, -2, m, 8, 13, n, 23, 28 ....
a = -12
b = -7 - (-12)
b = -7 + 12
b = 5
Un = a + ( n - 1 )b
m = U4
U4 = -12 + ( 4 - 1 )5
U4 = -12 + ( 3 )5
U4 = -12 + 15
U4 = 3
n = U7
U7 = -12 + ( 7 - 1 )5
U7 = -12 + ( 6 )5
U7 = -12 + 30
U7 = 28
m + n = 3 + 28 = 31