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Consider the arithmetic series
Let t=1 in the given series, we get
first term = = 3-4 = -1.
Let t=2 in the given series, we get
second term = =
Let t=3 in the given series, we get
third term =
Now, let t=18 in the given series, we get
last term = l =
We get the series as
-1, 2, 5,..... 50
Sum =
=
=
= 441
Therefore, the sum of the given arithmetic series is 441.
