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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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
~~
semoga membantu