Combine the like terms: 6a + 8b - 3a
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Let the first term be a, 4th term be , difference between terms be d, and sum of first nine terms be
.
= a + 3d
32 = 11 + 3d
3d = 32 - 11
3d = 21
d = 7
=
=
= 9(11+28)
= 9(39)
= 325
Sum of first nine terms is 351.