Un = a + (n - 1) × b
U5 = -91 + (5 - 2) × 7
= -91 + 28
= -63
U6 = -56
U8 = -49
U9 = -42
dst
-91, -84, -77, -70, -63, -56, -49, -42, -35, -28, -21, -14, -7, 0, 7, 14, 21, 28, 35, -42, 49, 56
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Un = a + (n - 1) × b
U5 = -91 + (5 - 2) × 7
= -91 + 28
= -63
U6 = -56
U8 = -49
U9 = -42
dst
-91, -84, -77, -70, -63, -56, -49, -42, -35, -28, -21, -14, -7, 0, 7, 14, 21, 28, 35, -42, 49, 56