16.
What is the sum of the first 17 terms of an arithmetic progression if the first term is -20 and last term is 28?

17.
The 4th and 7th term of an arithmetic progression are 11 and -4 respectively. What is the 15th term?

18.
The 3rd and 8th term of an arithmetic progression are -13 and 2 respectively. What is the 14th term?

19.
What is the sum of the first 11 terms of an arithmetic progression if the 3rd term is -1 and the 8th term is 19?

20.
What is the sum of the first 13 terms of an arithmetic progression if the first term is -10 and last term is 26?

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