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Un = 45 dan U₄ = 17
Ut = (a + Un) / 2
25 = (a + 45) / 2
50 = a + 45
a = 5
U₄ = 17 = a + 3b
17 = 5 + 3b
12 = 3b
b = 4
Un = a + (n - 1) x b
45 = 5 + (n - 1) x 4
45 = 5 + 4n - 4
45 = 1 + 4n
44 = 4n
n = 11
Jadi banyak suku adalah: 11
semoga jelas dan membantu ya