Find the indicated terms in each of the following arithmetic progressions `a=21,d=-5,t_n,t_25`

Find the indicated terms in each of the following arithmetic progression a=3,d=2,t_(n),t_(10)

Find the indicated terms in each of the following arithmetic progression 5,2,-1...t_(10)

Find the indicated terms in each of the following arithmetic progression 16,11,16,...,t_(61)

Find the sum of indicated terms of each of the following geometric progression: 1,-3,9,-27, ….9 terms

Find the sum of indicated terms of each of the following geometric progression: 1, -1/2, 1/4, - 1/8, .., n terms

Find the sum of indicated terms of each of the following geometric progression: 1,2,4,8,…….,12 terms

Find the sum of indicated terms of each of the following geometric progression: 1, 1/3, 1/9, 1/27, …., n terms

Find the sum of indicated terms of each of the following geometric progression: x^2,x^4,x^6,…,n terms (x!=+-1)

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

Find the sum of indicated terms of each of the following geometric progression: 1+2/3+4/9+….,n terms and 5 terms