21.
What is the sum of the first 12 terms of an arithmetic progression if the first term is -19 and last term is 36?

22.
The 3rd and 7th term of an arithmetic progression are -9 and 11 respectively. What is the 15th term?

23.
What is the sum of the first 12 terms of an arithmetic progression if the 3rd term is -13 and the 6th term is -4?

24.
If the 3rd and the 5th term of an arithmetic progression are 13 and 21, what is the 13th term?

25.
The 3rd and 6th term of an arithmetic progression are 13 and -5 respectively. What is the 11th term?

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