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Un = suku ke
a = angka pertama
b = beda
b = 93-99 = -6
U22 = 99+(22-1)(-6)
= 99 + ( 21 x (-6))
= 99 - 126
=-27 (A)
semoga membantu:)
a = 99
b = 93 − 99 = −6
Un = a + (n −1)b
Un = 99 + (22 − 1)(−6)
Un = 99 + (21)( −6) = 99 − 126 = − 27