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Verified answer
Dik. barisan deret aritmatikaU7 = 17 & U10 = 23.
Dit. Suku ke-21 (U21) ?
Jawab...
u10 = a + 9b = 23
u7 = a + 6b = 17
----------------------- (-)
3b = 6
b = 6/3
b = 2
a :
a + 6b = 17
a + (6) (2) = 17
a + 12 = 17
a = 17 - 12
a = 5
Un = a + (n - 1) b
U21 = a + 20b
U21 = 5 + (20) (2)
U21 = 5 + 40
U21 = 45
Semoga membantu... ^_^