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Materi : Barisan dan deretSn = n/2 ( 2. U1 + (n - 1) b)
900 = 15/2 ( 2 . 11 + (15 - 1) b)
900 = 7,5 ( 22 + 14b)
900 = 165 + 105b
900 - 165 = 105b
735 = 105
735/105 = b
7 = b
Jadi , besar beda antar suku = 7
1. Sn = n/2 ( 2. U1 + (n - 1) b)
2. 900 = 15/2 ( 2 . 11 + (15 - 1) b)
3. 900 = 7,5 ( 22 + 14b)
4. 900 = 165 + 105b
5. 900 - 165 = 105b
6. 735 = 105
7. 735/105 = 7 = b
Jawaban dari besar antar suku adalah 7
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