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Verified answer
Suku pertama = u1u1 = 15 - 4(1)
u1 = 15 - 4
u1 = 11
u2 = 15 - 4(2)
u2 = 15 - 8
u2 = 7
beda = u2 - u1
beda = 7 - 11
beda = -4
jadi suku pertama = 11
beda = -4