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?

26.
The 3rd and 9th term of an arithmetic progression are -8 and 10 respectively. What is the 16th term?

27.
If the Arithmetic mean of 7, 5, 13, x and 9 is 10, then the value of x is

28.
What is the sum of the first 9 terms of an arithmetic progression if the first term is 7 and last term is 55?

29.
If 7 times the seventh term of an Arithmetic Progression (AP) is equal to 11 times its eleventh term, then the 18th term of the AP will be

30.
The 7th and 12th term of an arithmetic progression are -15 and 5 respectively. What is the 16th term?