Find the next four terms of each of the following arithmetic progressions:
`1/2,1/3,1/6,………`

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

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

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 the sums of the indicated number of terms of the following geometric progressions : 2,-1/2,1/8 , ........., n terms, 12 terms.

Find the inverse of each of the folowing matrices: [(3,1),(-1,2)]

Find the inverse of each of the following matrices: {:[(-1,5),(-3,2)]

Find the sums of the indicated number of terms of the following geometric progressions : x^2-y^2,x-y, (x-y)/(x+y) , ...., n terms (x+y ne 1) .