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U₆ + U₇ = a + 5b + a + 6b = 45
= 2a + 11b = 45
a + 2b = 12 ---------------> 2a + 4b = 24 (dikalikan 2)
2a + 11b = 45 -------------> 2a + 11b = 45
____________ _
- 7 b = - 21
b = 3 ------> a + 2b = 12
a + 6 = 12
a = 6
Jumlah 24 suku pertama = 1/2. 24.(6 + 6 + (24 - 1). 3)
= 972
Maaf sambil dikoreksi hitungannya barangakali salah ketik atau hitung