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Dik. barisan deret aritmatika :U5= 7 & U8 = 13
Dit. Suku ke-20 (U20) ?
Jawab...
beda (b) :
U5 = a + 4b = 7
U8 = a + 7b = 13
---------------- -
》 -3b = -6
》 b = 2
Suku pertama (U1)
》a + 4b = 7
》a + 4(2) = 7
》 a + 8 = 7
》 a = 7-8
》 a = -1
Suku ke-20 (U20) :
》 U20 = a + 19b
》 U20 = -1 + 19 (2)
》 U20 = -1 + 38
》 U20 = 37
Semoga membantu.. ^_^