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beda = b = 13-15 = -2
Un = a + (n-1)b
Un = 15 + (n-1)-2
Un = 15 + -2n + 2
Un = 17 - 2n
U16 = 17 - 2(16) = 17 - 32 = -15
U20 = 17 - 2(20) = 17 - 40 = -23
jawaban = D
U16 = -2 (16) + 17
=-32 + 17
= -15
U20 = -2 (20) + 17
= -40+17
= -23
JAWABAN : D