Assalamualaikum Ka Tolong Kerjakan Sama Pakai caranya.​

a = U1 = 10

b = U2 – U1 = 7 – 10 = -3

Un = a + (n-1)b

U51 = 10 + (51-1)(-3)

U51 = 10 + (50)(-3)

U51 = 10 – 150

U51 = -140

opsi jawaban = A. -140

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semoga membantu