Jawaban:
C 1572
Penjelasan dengan langkah-langkah:
U7 = a + 6b ⇒ a + 6b = 38
U3 = a + 2b ⇒ a + 2b = 18
4b = 20
b = 5 substitusikan ke
a + 2b = 18
a + 10 = 18
a = 8
Sn = (n/2)(2a + (n-1)b)
S24 =(24/2)(16 + (24-1)5)
= 12(16 + 115)
= 12 x 131
= 1572
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Jawaban:
C 1572
Penjelasan dengan langkah-langkah:
U7 = a + 6b ⇒ a + 6b = 38
U3 = a + 2b ⇒ a + 2b = 18
4b = 20
b = 5 substitusikan ke
a + 2b = 18
a + 10 = 18
a = 8
Sn = (n/2)(2a + (n-1)b)
S24 =(24/2)(16 + (24-1)5)
= 12(16 + 115)
= 12 x 131
= 1572