The sum of the terms of a sequence is:
always divergent
a series
always finite
Find the sum of the first $10$10 terms of the arithmetic sequence defined by $T_1=6$T1=6 and $T_{10}=3.5$T10=3.5.
Find the sum of the first $10$10 terms of the arithmetic sequence defined by $T_1=-8$T1=−8 and $T_{10}=-2.75$T10=−2.75.
Find the sum of the first $20$20 terms of the arithmetic sequence defined by $T_1=\pi$T1=π and $T_{20}=20\pi$T20=20π.