4. Tentukan Suku ke 25 dari -3,2,7....
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Jawaban:
u25 = a + 24b
= -3 + 24(5)
= -3 + 120
= 117
Suku ke 25 dari -3,2,7...
a = -3
b = U2 - U1
= 2 - (-3)
= 5
• Dicari U25
U25 = a + (n - 1)b
= -3 + (25 - 1)5
= -3 + 24 × 5
= -3 + 120
= 117
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