Find the next four terms of each of the following arithmetic progressions:
a+b,a-b,a-3b,………

Find 'd' and write the next four terms of the following arithmetic progression : -1, 1/4, 3/2 ,...........

Find the 20th term from the end of the following arithmetic progressions.,- 3, 8, 13,……,253 .

Find the 20th term from the end of the following arithmetic progressions.,- 1, 4, 7, 10, ....... 88.

Find the sum of indicated number of terms of the following arithmetic progression : 16, 11, 6,..........., n terms, 23 terms.

Find 'r' and write the next four terms of the following progressions : -2/3 , -6, -54,........

Find the sums of the indicated number of terms of the following geometric progressions : 1,1/3,1/9 .........., n terms, 5 terms.

Find out which of the following sequences are arithmetic progressions. For those which are arithmetic progressions, find out the common difference. :- a + b, (a + 1) + b, (a + 1) + (b + 1), (a + 2) + (b + 1), (a + 2) + (b + 2)…….

Find out which of the following sequences are arithmetic progressions. For those which are arithmetic progressions, find out the common difference. :- 3, 3, 3, 3, …….

Find out which of the following sequences are arithmetic progressions. For those which are arithmetic progressions, find out the common difference. :- 3,6,12,24,….

Find out which of the following sequences are arithmetic progressions. For those which are arithmetic progressions, find out the common difference. :- -225,-425,-625,-825,….